Two men wake up to find themselves shackled in a grimy, abandoned bathroom. As they struggle to comprehend their predicament, they discover a disturbing tape left behind by the sadistic mastermind known as Jigsaw. With a chilling voice and cryptic instructions, Jigsaw informs them that they must partake in a gruesome game in order to secure their freedom. Two strangers awaken in a room with no recollection of how they got there, and soon discover they're pawns in a deadly game perpetrated by a notorious serial killer.