When Harley joins her boyfriend for a Halloween weekend at his family's estate, they’re invaded by a band of masked freaks and forced into playing a game. But the intruders don’t know that Harley is ready to fight back with her own tricks.

When a nature photographer explains to the Police how she fought her way out of the Watchatoomy Valley, they dismiss her crazed and violent story as a meth-induced nightmare. But when they discover that she's telling the truth, it's too late.