16-year-old Clary Fray is an ordinary teenager, who likes hanging out in Brooklyn with her friends. But everything changes the night she witnesses a murder, committed by a group of teens armed with medieval weaponry.

Darkness has descended on the Shadowhunter world. Chaos and destruction overwhelm the Nephilim as Clary, Jace, Simon, and their friends band together to fight the greatest evil they have ever faced: Clary's own brother. Nothing in this world can defeat Sebastian--but if they journey to the realm of demons, they just might have a chance..