When a crop of doped-up athletes from the Lakecrest College swim team dive into the campus lake to blow off some steam, the bloodsucking leeches below the surface undergo a stunning transformation. After ingesting small amounts of the swimmers’ steroid-laced blood, the slimy creatures grow to unusual sizes and set out to sink their teeth into an unsuspecting student population.

Angela’s sister wants to make a revenge game up on her, inviting to mystery farm her old friends, to participate into a game with fake blood and knifes – but Angela and her disturbed boyfriend Charlie were not supposed to know about the fake part. But what starts as a little friendly game, get dark and bloody with real deaths – and sure, real blood and knifes.