Art student Clary Fray's life is turned upside down when she discovers that she is a Shadowhunter and part of a hidden world on the brink of war.

Determined to restore her lost memories, Clary and her new Shadowhunter allies enlist the mysterious Silent Brothers.

After the New York vampire clan kidnaps Simon, Jace trains Clary so she can join them on the rescue mission.

Clary enlists the help of mysterious warlock Magnus Bane to summon the demon that has taken her memories. A deep secret is revealed about Alec.

Clary, Alec and Simon look for clues that will lead them to Valentine, until Clary and Simon run into the New York werewolf pack.

As a wounded Luke fights for his life, he reveals to Clary the secret history between him, Jocelyn and Valentine.

The Shadowhunters know where the Mortal Cup is hidden, but a police precinct full of suspicious mundanes and shape-shifting demons stand in their way.

Clary ponders whether to resurrect Simon as a vampire. At the Institute, the appearance of Clave envoy Lydia Branwell forces Alec to make a sacrifice.