Clary Fray has just enrolled at Brooklyn Academy of Arts. On her eighteenth birthday, she learns that she is a Shadowhunter, a human born with angelic blood who protect humans from demons. That night, Clary's mother, Jocelyn Fray, is abducted by a group of rogue Shadowhunters of "The Circle". Their leader is Jocelyn's husband Valentine Morgenstern.
With her mother missing, Clary turns to Luke, a person she trusted, only to seemingly be betrayed. Clary joins up with a band of Shadowhunters to save her mother and discovers powers she never knew she possessed. Clary is thrown into the world of demon hunting with the mysterious, narcissistic, and attractive Shadowhunter, Jace, and also her loyal and geeky friend, Simon. Now living among faeries, warlocks, vampires, and werewolves, Clary begins a journey of self-discovery as she learns more about her past and what her future may hold.