Cassandra Clare

Clary Fray discovers a hidden world of Shadowhunters—warriors who protect humans from demons—after witnessing a mysterious murder that no one else can see. Soon she learns that she has a deeper connection to this secret world than she ever imagined, especially to Jace, a skilled Shadowhunter with a complicated past. As Clary searches for her missing mother, she becomes caught in a dangerous conflict involving vampires, werewolves, and dark forces threatening both the human and Shadowhunter worlds.