For four outcast teens, summer detention means being assigned to clean their high school after a horrific incident. But they are not alone; a macabre gang wearing guises of The Four Horsemen Of The Apocalypse - Famine, Pestilence, War and Death - has locked them inside and is hunting them through the school's ravaged hallways. As the four students battle to survive, each must confront the supernatural echoes of past traumas they have struggled to forget - and may be condemned to relive.

After a local woman is murdered, a group of teenage liars create a warning e-mail of a serial killer named “The Wolf”, coming on the next full moon. The teens describe each death method The Wolf uses, but when the described victims actually do start turning up dead, suddenly no one knows where the lies end and the truth begins.