“To love is to destroy, and to be loved is to be the one destroyed.”
— Jace's thoughts on love and the destructive nature of his relationship with Clary.
Archivist's Choice
City of Lost Souls
Cassandra Clare (2012)
Genre
Fantasy / Young Adult / Romance
Reading Time
546 min
Key Themes
See below
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Bound by dark magic to her evil brother Sebastian, Jace becomes a weapon, forcing Clary to risk her soul in a desperate quest to sever their connection and reclaim the boy she loves before he is lost forever.
Synopsis
Clary Fray is devastated when Jace is bound to her evil brother Sebastian by a powerful demonic ritual, making Jace a servant of evil. The Clave, the Shadowhunters' governing body, seeks to destroy Sebastian, but this would also kill Jace. Clary makes a dangerous decision: she joins Jace and Sebastian, pretending to be on their side, hoping to find a way to sever the bond without harming Jace. While Clary navigates this deception, her friends—Simon, Isabelle, Alec, and Magnus—search for an alternative solution, bargaining with supernatural groups and facing their own trials.
As Clary witnesses Sebastian's plans and Jace's transformation, she tries to find the true Jace beneath the demonic influence. Simon, now a Daylighter, becomes a key part of the search, facing his own problems and making a sacrifice involving the Mark of Cain. The story ends with a confrontation where the Mortal Sword severs the bond between Jace and Sebastian, but with severe consequences for Jace, who is infused with 'heavenly fire.' Jace recovers, though with lasting effects, Sebastian is still a threat, and Simon adjusts to a new life, leaving the Shadowhunter world in a fragile peace.
Reading time
546 min
Difficulty
Medium
Pacing
Moderate
Mood
Suspenseful, Romantic, Dark, Intense, Emotional
✓ Read this if...
You're deep into The Mortal Instruments series and need to know what happens to Jace after his disappearance, or if you enjoy high-stakes YA fantasy with complex moral dilemmas and intense romantic tension.
✗ Skip this if...
You haven't read the previous books in The Mortal Instruments series, as it's the fifth installment and heavily reliant on prior plot points and character development.
Plot Summary
The Unholy Bond Revealed
After the previous book, Clary Fray searches for Jace Herondale, who disappeared after Lilith resurrected him. When she finds him, she discovers Jace is not himself. He is under Lilith's magic, which created a 'binding rune' between him and her evil brother, Sebastian Morgenstern. Jace, now a 'heavenly fire' being, acts cold and cruel. He is inseparable from Sebastian. Clary tries to reach the Jace she knows, but he seems lost, his true self suppressed by the demonic connection, making him a reluctant helper in Sebastian's plans.
Sebastian's Hideout and Clary's Decision
Clary tracks Jace and Sebastian to a hidden apartment in New York. Despite the danger, she confronts them. Sebastian does not harm her; instead, he tries to convince her to join them, appealing to their shared bloodline. Jace, though controlled, shows brief glimpses of his former self, which gives Clary hope. Realizing the only way to save Jace is to stay close, Clary decides to pretend alliance with Sebastian, leaving her friends and family to infiltrate their circle and search for a way to break the binding rune without killing Jace.
The Search for Answers: Simon and Isabelle
Meanwhile, Clary's friends search for a solution. Simon Lewis, still bearing the Mark of Cain, and Isabelle Lightwood, heartbroken over Jace, begin their own investigation. They seek counsel from the Seelie Queen, who is cryptic but hints at powerful ancient magic. Their journey then leads them to the Iron Sisters, a group of Shadowhunter women who forge weapons. They hope the Sisters know of a weapon or ritual to sever the demonic bond without harming Jace, but the Sisters are cautious, and their knowledge of such dark magic is limited.
Alec and Magnus's Desperate Bargain
Alec Lightwood is consumed with guilt and fear for Jace. He and Magnus Bane, the High Warlock of Brooklyn, explore every magical option. They consult other warlocks, seeking ancient spells or forgotten rituals. Their desperation leads them to make dangerous deals with Greater Demons, including the enigmatic Asmodeus, Magnus's father, for information or a cure. These bargains often come with a high price, straining Magnus and Alec's relationship and testing their morals as they risk everything for Jace.
A Glimpse of the True Jace
During their travels with Sebastian, the true Jace sometimes breaks through Lilith's control. These moments are brief but strong. He tells Clary the torment he endures, trapped in his own body, forced to watch Sebastian's actions. He expresses his desire to be free and his love for Clary, reaffirming her resolve. These glimpses are important for Clary, as they confirm that the Jace she loves is still alive within, fighting against the demonic influence, and worth saving.
The Road Trip of Horror
Sebastian embarks on a road trip across Europe with Jace and Clary. His goal is to gather followers and create chaos, showing his power and ruthlessness. They visit various Shadowhunter Institutes, not to attack directly, but to subtly corrupt and recruit, or to leave horrifying messages. Clary is forced to watch these acts, her heart heavy, knowing Jace is an unwilling participant. She struggles to maintain her loyalty to Sebastian while secretly gathering information and looking for weaknesses in the binding rune.
The Heavenly Fire's Origin
Through her observations and interactions with Jace, Clary begins to understand his resurrection. He was brought back not by demonic means alone, but infused with 'heavenly fire' – a powerful, divine energy. This fire protects him from Lilith's full control, but it is also linked to the binding rune with Sebastian. Harming Sebastian would unleash this fire, destroying Jace as well. Clary realizes that any solution must be precise, targeting the binding without triggering Jace's self-destruction.
The Clave's Desperation
The Clave, the Shadowhunters' governing body, is upset about Sebastian's return and his alliance with Jace. Led by Inquisitor Aldertree, they are determined to eliminate Sebastian at any cost, even if it means sacrificing Jace. They see Jace as corrupted and a danger to the Shadowhunter world. This stance puts them against Clary's friends, who fight to save Jace, creating a race against time to find a solution before the Clave acts.
Simon's Sacrifice
In a moment of desperation to save Magnus, Simon, along with Isabelle and Alec, travels to Edom, Asmodeus's demonic realm. There, Asmodeus offers a deal: he will save Magnus and provide information on breaking the binding rune if Simon gives up his immortality and the Mark of Cain, becoming human again. Simon, seeing no other choice and driven by his love for his friends, agrees. The Mark is removed, and he is stripped of his vampiric abilities, a sacrifice that leaves him vulnerable but saves his friends.
The Mortal Sword's Power
Through her investigations and information from various sources, Clary learns about the Mortal Sword. This ancient Shadowhunter artifact, one of the Mortal Instruments, can sever magical bonds, including the one between Jace and Sebastian. However, the solution is not simple. Using the sword would sever the bond, but the resulting release of heavenly fire from Jace would be devastating, potentially destroying him or causing immense damage. Clary must find a way to use it precisely.
The Confrontation at the Dark Institute
Sebastian leads Jace and Clary to a corrupted Shadowhunter Institute, planning a display of power and recruitment. The Clave, having tracked them, launches an assault. A fierce battle follows, with Shadowhunters fighting Sebastian's demon-infused followers. Clary is caught between the two sides, trying to protect Jace while looking for an opportunity to act. During the chaos, Jace's heavenly fire is accidentally unleashed, causing immense damage and forcing the Clave to retreat, further cementing their belief that Jace is lost.
The Final Battle and the Severing of the Bond
In a confrontation, Clary, armed with the Mortal Sword, faces Sebastian and the controlled Jace. Seizing a moment of vulnerability, Clary uses the sword to sever the binding rune. The act is painful for both Jace and Sebastian. The heavenly fire within Jace erupts violently, burning away the demonic influence but also severely injuring him. Sebastian, no longer bound, is weakened but escapes. Jace is freed, but the lingering effects of the heavenly fire and the trauma of his possession leave him wounded and changed.
Jace's Recovery and Lingering Effects
After the bond is broken, Jace is in critical condition, his body damaged by the heavenly fire. He slowly recovers, but the experience has left its mark. He is no longer under Sebastian's control, but the heavenly fire now resides within him, making him unique and dangerous. He struggles with the memories of his actions while possessed and the trauma of being an unwilling instrument of evil. Clary, along with his friends and family, supports him through his recovery, but they all understand that Jace is forever changed by the ordeal.
Simon's New Life
Simon, now human, faces the challenges of living without his vampiric abilities and memories of his past life as a vampire. He struggles with the loss of his immortality and the Mark of Cain, which had given him a unique identity and power. He must learn to navigate the mundane world again while still involved with the Shadowhunters. His relationship with Isabelle deepens as they both adjust to the new normal, showing his sacrifice and the strength of his character.
A Precarious Peace and Sebastian's Threat
With Jace freed, a fragile peace settles over the Shadowhunter world, but Sebastian Morgenstern remains a threat. He is still at large, having escaped the final confrontation, and is more dangerous than ever, fueled by revenge and his desire to corrupt the world. The Clave is left to pick up the pieces, and the Shadowhunters must prepare for the next confrontation. The events have changed the protagonists, leaving them stronger but also scarred, with the knowledge that their fight against Sebastian is far from over.
Principal Figures
Clary Fray
The Protagonist
Clary evolves from a reactive participant to a proactive agent, making dangerous sacrifices and embracing her unique abilities to confront evil directly.
Jace Herondale
The Protagonist/Antagonist (under influence)
Jace undergoes a profound internal struggle, being both victim and perpetrator, before being freed, though forever changed by the heavenly fire.
Sebastian Morgenstern (Jonathan Christopher Morgenstern)
The Antagonist
Sebastian solidifies his role as the ultimate villain, revealing the extent of his ambition and cruelty, and escapes to continue his reign of terror.
Simon Lewis
The Supporting Protagonist
Simon sacrifices his immortality and unique powers for his friends, returning to humanity and embracing a new path.
Isabelle Lightwood
The Supporting Protagonist
Isabelle confronts her emotional vulnerabilities and deepens her commitment to Simon and her family, becoming a more well-rounded character.
Alec Lightwood
The Supporting Protagonist
Alec's loyalty to Jace and love for Magnus are tested, forcing him to make difficult choices that strengthen his resolve and define his path.
Magnus Bane
The Supporting Protagonist
Magnus confronts his past and makes immense sacrifices for Alec and his friends, solidifying his role as a compassionate, if reluctant, hero.
Lilith
The Mentioned/Influential Antagonist
Lilith's influence sets the stage for the conflict, her magic serving as the primary obstacle to Jace's freedom.
Asmodeus
The Mentioned/Supporting Antagonist
Asmodeus acts as a powerful, self-interested gatekeeper of knowledge, ultimately facilitating a major sacrifice.
Themes & Insights
The Price of Love and Sacrifice
This theme explores how far characters will go for those they love, and the personal costs. Clary risks her safety and moral comfort by joining Sebastian to save Jace. Simon gives up his immortality and the Mark of Cain to save Magnus and help free Jace. Alec and Magnus risk their relationship and make dangerous deals with demons. These acts show that love often demands sacrifice, which can leave lasting scars, as seen in Jace's altered state and Simon's return to humanity.
“What price is too high to pay, even for love?”
Identity and Corruption
The novel examines how identity can be changed by outside forces. Jace's struggle under Lilith's binding rune is central, as his true self is suppressed by a cruel, demonic persona. He is forced to watch his own actions, creating an internal battle. Sebastian, already corrupted, tries to corrupt others. This theme questions whether one's true self can be lost entirely or if it always lingers, fighting for recognition, and how one reclaims identity after trauma.
“He was still Jace, and not Jace, at the same time. A walking contradiction, a beautiful lie.”
The Nature of Good and Evil
The lines between good and evil are blurred throughout the story. Jace, a hero, is forced to commit evil acts, challenging the Clave's black-and-white view of him. Clary makes morally questionable choices by pretending to ally with Sebastian. The Clave, in its desire to destroy Sebastian, is willing to sacrifice Jace, raising questions about their own righteousness. The 'heavenly fire' within Jace, a divine force, is also destructive, suggesting that even good can have dangerous, uncontrolled aspects.
“There is no good or evil, only power and those too weak to seek it.”
Family Bonds and Betrayal
The idea of family, both biological and chosen, is a strong theme. Clary's biological bond with Sebastian is a source of both danger and a twisted connection he tries to exploit. Jace's parabatai bond with Alec is strained but lasts, representing deep loyalty. The Lightwood family's devotion to Jace, despite his corruption, shows the strength of chosen family. Betrayal is also central, with Sebastian's actions against the Shadowhunters and the Clave's willingness to abandon Jace feeling like a betrayal to his friends and family.
“Family is not just blood. It's the people who stand beside you when you're at your worst.”
Hope and Despair
The characters constantly swing between despair and hope. Clary's hope that Jace can be saved drives her actions, even when faced with his cruel words. The search for a cure has many setbacks, leading to moments of hopelessness for Alec and Magnus. Simon's sacrifice comes from despair but leads to renewed hope. The story suggests that even in the darkest times, hope can be a powerful motivator, but it requires resilience in the face of great challenges.
“Hope was a dangerous thing. It was a drug, a poison, but it was also the only thing that kept them going.”
Plot Devices & Literary Techniques
Binding Rune
A magical rune created by Lilith that inextricably links Jace and Sebastian.
The binding rune is the central plot device, creating the core conflict of the novel. It physically and magically links Jace and Sebastian, making them inseparable and forcing Jace to be Sebastian's unwilling companion. The rune ensures that any harm to Sebastian would also kill Jace, creating an impossible dilemma for Clary and the Clave. Its existence drives the desperate search for a way to sever the bond without sacrificing Jace, pushing characters to make extreme choices and seek powerful, often dangerous, solutions.
Heavenly Fire
Divine energy infused into Jace during his resurrection, protecting him but also a destructive force.
The heavenly fire is a unique and powerful element within Jace, stemming from his resurrection. It acts as a counterpoint to the demonic influence, preventing Lilith from completely controlling him and occasionally allowing the true Jace to surface. However, it is also a volatile and destructive force, capable of immense devastation if unleashed. The paradox of this 'good' power being so dangerous, especially when linked to the binding rune, adds complexity to Jace's condition and the quest to save him, as its release is a significant risk.
The Mortal Sword (Maellartach)
An ancient Shadowhunter artifact capable of discerning truth and severing magical bonds.
The Mortal Sword is one of the three Mortal Instruments, a powerful artifact of the Shadowhunters. In this book, its primary function as a plot device is its ability to sever magical bonds. This becomes the ultimate, albeit dangerous, solution to breaking the binding rune between Jace and Sebastian. Its use requires immense courage and precision, and its inherent power is a double-edged sword, capable of both salvation and destruction, making it the focal point of the final confrontation and the resolution to Jace's plight.
The Mark of Cain
A divine mark on Simon Lewis that grants him protection and immortality.
The Mark of Cain is a divine blessing/curse placed upon Simon, making him invulnerable to harm and providing him with the immortality of a Daylighter vampire. As a plot device, it initially protects him in dangerous situations. However, its true significance emerges when Asmodeus demands its removal as the price for saving Magnus and providing crucial information. Simon's decision to sacrifice the Mark highlights the theme of self-sacrifice and the difficult choices characters make for love and friendship, altering his status and abilities irrevocably.
The Parabatai Bond
A sacred, magical bond between two Shadowhunters, enhancing their abilities and connecting their souls.
The parabatai bond between Jace and Alec is a recurring plot device that deepens their connection and adds emotional weight to Jace's predicament. This magical bond means that Alec can feel Jace's pain and distress, making Jace's suffering even more tangible and driving Alec's desperation to save him. The bond also implies a shared destiny and strength, and its potential weakening or breaking due to Jace's corruption adds another layer of threat and urgency to their quest, emphasizing the profound connection between the two characters.
Critical analysis
Notable Quotes
“The greater the love, the greater the tragedy when it's over. And the magic, Clary, is that you know that, and you still are willing to love, knowing it might end badly. That's the best part of all.”
— Magnus Bane's wisdom to Clary about the nature of love and its inherent risks.
“When you love someone, you don't just stop. You don't just turn it off. It's a part of you, and it's always there.”
— Clary's internal struggle and realization about her feelings for Jace, even when he's under Sebastian's influence.
“There is no pretending. I love you, and I will love you until I die, and if there's life after that, I'll love you then.”
— Jace's heartfelt confession to Clary, expressing the depth and permanence of his love.
“You don't get to choose who you love. You just don't. It's not a switch you can turn on and off.”
— Simon's internal monologue about his feelings for Isabelle, and the uncontrollable nature of love.
“Sometimes the only way to save a person is to give up a piece of yourself.”
— Jocelyn's reflection on the sacrifices made for loved ones, particularly in the context of her children.
“It's hard to be a hero when you're afraid.”
— Alec's internal thoughts about his fears and the pressure to be strong for others.
“Everyone makes mistakes. The important thing is to learn from them.”
— Luke's advice to Clary, emphasizing resilience and growth.
“Love is a decision, not just a feeling. It is a promise.”
— Magnus's perspective on the active choice and commitment involved in love.
“The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing.”
— A general philosophical statement made by one of the characters, reflecting on inaction.
“Hope is not a thing with feathers. Hope is a thing with teeth.”
— Jace's cynical but determined outlook, suggesting hope requires struggle and fight.
“Sometimes, the only way to get a thing done is to do it yourself.”
— Isabelle's practical and assertive approach to situations, often taking charge.
“We are all broken, that's how the light gets in.”
— A metaphorical statement about finding beauty and strength in imperfections, often attributed to Leonard Cohen but used in the narrative.
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Key Questions (FAQ)
The central conflict revolves around Clary's desperate attempt to separate Jace from her evil brother, Sebastian, after Lilith's magic binds them. This creates a moral dilemma for the Clave, as harming Sebastian would also kill Jace, leading Clary to pursue dangerous, unsanctioned methods to save him.
About the author
Cassandra Clare is a celebrated author of young adult fantasy, best known for her bestselling Shadowhunters series, which includes "City of Ashes" and "Clockwork Prince." Her intricate world-building and complex characters have captivated millions of readers worldwide. Clare's work often blends magical elements with relatable coming-of-age themes.
