It starts innocently enough. Four kids - three girls, one boy - are at one of their houses, playing games. One of them has read about "Bloody Mary" and the idea that if you look into a mirror and say her name thirteen times, she will show you the future. Some legends say she'll show you your one true love or a skull to mark your death within five years. Others say that conjuring Bloody Mary will bring her into your world. Both sets of legends are true. The kids go through with the act, saying her name thirteen times. Just short of five years later, the four of them are no longer friends, having gone on separate paths. That day in school, a new girl arrives. Her name is Mary . . . .