City of Bones (#1) by Cassandra Clare

TWO WORLDS WILL COLLIDE,

When Clary Fray heads out to the Pandemonium Club in New York City she hardly expects to witness a murder- much less a murder committed by three teenagers covered with odd markings. This is Clary's first meeting with the Shadowhunters, warriors dedicated to ridding the earth of demons and keeping the odd werewolves and vampires in line. It's also her first meeting with gorgeous golden-haired Jace. Within twenty-Four hours Clary is pulled into Jace's world with a vengeance when her mother disappears and Clary herself is attacked by a demon. But why would demons be interested in an ordinary girl like Clary? And how did she suddenly get the Sight? The Shadowhunters would like to know...