Judith Lewis, better known by her pen name Cassandra Clare, is an American author of young adult fiction, best known for her bestselling series The Mortal Instruments.
In the second installment of the Mortal Instruments series, Clary finds herself falling deeper into New York City's underworld of demons, werewolves, vampires and Shadowhunters.
When Clary visits a nightclub, she discovers that she is one of the Shadowhunters - a group of demon-hunters living in a world of vampires, werewolves and warlocks.