When Elena is talked into attending an underground warehouse party with her friends, she finds herself caught in a nightmarish trap where the revelers are mowed, sliced and crushed to death by a macabre series of contraptions operated by a masked psychopath. When the grisly massacre is over, Elena is the only survivor. But before she can escape, she is locked in a trunk and transported to an unknown location. Fortunately for Elena, one man - Arkin - knows exactly where she's headed, having just escaped from there with his life and sanity barely intact. Elena's wealthy father hires a crack team of mercenaries to force Arkin to lead them to the killer's lair. But even these hardened warriors are not prepared for what they encounter.