Judas Child by Carol O'Connell
It is three days before Christmas, and two young girls have disappeared from the local academy. This hasn't happened for fifteen years, since Rouge Kendall's twin sister was murdered. The killer was found, but now Rouge, twenty-five and a policeman, is forced to wonder: Was he really the one? Also wondering is a former classmate named Ali Cray, a forensic Psychologist with scars of her own. The pattern is the same, she says: a child called out to meet a friend. The friend is the bait, the Judas child, and is quickly killed, but the primary victim lives longer...until Christmas Day.