Millie Kessler, 17, is not popular in high school, and the recent loss of her father nearly broke her teenage girl. One day after a football match, she is left alone and becomes the victim of a serial killer who preys exclusively on schoolgirls. Having stabbed Millie with an ancient Aztec dagger, the maniac mysteriously changes bodies with the girl. Now the main character in the body of the killer has to reveal the secret of the dagger and convince her friends that it really is her. Milly has only 24 hours to return to her body.