City of Bones is the first of three books in my young adult urban fantasy trilogy, The Mortal Instruments. City of Bones is about a fifteen-year old girl named Clary Fray, whose search for her missing mother leads her into an alternate New York called Downworld, filled with mysterious faeries, hard-partying warlocks, not-what-they-seem vampires, an army of werewolves, and the demons who want to destroy it all. She also finds herself torn between two boys — her best friend, Simon, for whom she’s developing new feelings, and the mysterious demon hunter, Jace. She becomes a part of the secret world of the demon hunters, or Nephilim, and as she does she discovers that rescuing her mother might mean putting their whole world in jeopardy. City of Bones is followed by the second book, City of Ashes, and the third, City of Glass. You can find all sorts of detailed information about these books on the Mortal Instruments website.