A childhood indiscretion has terrifying repercussions for a group of small town teens preparing for their high school graduation. When Sandy Channing and her friends were young, they committed a terrible wrong against an innocent peer. Years later, Sandy has become class president, and the incident has been all but forgotten. But when Sandy's friends start to go missing, the only way to stop the supernatural wrath of their vengeful classmate is to unearth a grim secret from the distant past.