Chapter 1: The Shadow of Herondale
* Jem Carstairs, a Shadowhunter with Downworlder blood, investigates a series of murders targeting Herondale family members.
* He suspects the involvement of Zara Dearborn, a demon-possessed warlock who was once in love with him.
Chapter 2: The Lost Herondale
* Jem and his companions, Brother Zachariah and Tessa Gray, track down Zara and confront her.
* They learn that she is seeking revenge on the Herondales for what they did to her in the past.
* Jem realizes that his own brother, Gabriel, is a Herondale and may be Zara's target.
Chapter 3: The Shadowhunter's Curse
* Jem and his friends infiltrate the Herondale manor on Blackthorn Hill.
* They encounter a mysterious curse that prevents them from speaking the name "Herondale."
* Tessa discovers that the curse was cast by Asmodeus, a demon who possessed her ancestor, Will Herondale.
Chapter 4: The Spiral Labyrinth
* Jem and Gabriel become trapped in a deadly labyrinth under the manor.
* They face challenges designed to test their wills and loyalty to each other.
* Zara appears and reveals her true intentions: she wants to destroy the Herondale bloodline and claim Gabriel for herself.
Chapter 5: The Silence of Herondale
* Jem and Gabriel confront Zara and Asmodeus in the labyrinth's heart.
* Asmodeus reveals that the curse of silence was a way to prevent the Herondales from summoning their true power.
* Jem breaks the curse by speaking the name "Herondale," unleashing the power of his blood and defeating Asmodeus.
Chapter 6: The Broken Circle
* Zara's demonic possession is broken, and she is reunited with Jem.
* Gabriel's memory of his past is restored, and he chooses to remain a Shadowhunter.
* Jem, Tessa, and their friends establish a new Shadowhunter conclave in London, dedicated to protecting the Downworld and bridging the divide between humans and Shadowhunters.
Chapter 7: The Legacy of Herondale
* Years later, Jem and Tessa pass their knowledge and wisdom to a new generation of Shadowhunters.
* The Herondale legacy continues, as Jem's daughter Anna becomes a renowned Shadowhunter and passes on the stories of their past to generations to come.
