This is the 12th book in a series of 13(I think.) Its main character is Tianna, a daughter of the moon goddess, Selene. It also has four other daughters in it, Jimena, Serena, Catty, and Vanessa. Tianna becomes frustrated after she meets Justin and Mason (Who killed her parents and sister) who say something about her becoming. After that, various members of the Atrox mention it, until finally, after all the daughters + Tianna's boyfriend are all facing almost certain death, Stanton tells her. After that, she must combat the evil and cunning leader of the Atrox. The Atrox himself.