Evan and her two older twin sisters, Skylar and Angel, go on vacation to New York after the end of 9th grade, for Evan, and 11th for her sisters. When they arrive there a man, that is totally out of it, tells the 3 of them that there is evil in this world, and the 3 of them are part of a secret race that can see, and hunt the evil, and if they don't destroy it, it will destroy them. They blow it off as just some crazy person, because New York is full of crazy people, until one night they are attacked and a boy about there age saves them. Skylar is being over protective of here sisters, Angel is scared and doesn't want to believe it, but Evan knows there is something wrong with the world as their eyes are opened to a new place with demons and other creatures that lurk in the darkness of the night. They are important, just like there mother who died when they were young. They are taken away from the places that they wanted to have a fun vacation at, and are shown a place hidden in New York, where others like them live. They are shown a new world that they could only imagine in there nightmares. And every demonic thing wants them dead, before the 3 of them can destroy all the evil in the world. But either way, the 3 sisters are going to die.
5 parts