Adam (Leigh Whannell) wakes up to find himself chained to a pipe and Dr. Lawrence Gordon (Carly Elwes) chained to a pipe on the opposite side of a dirty utility room. As the two captives try to find out how they got their, Dr. Gordan soon learns that they are victims of a serial killer known as the Jigsaw. The Jigsaw has left Dr. Gordon the instructions to kill Adam within eight hours or else they both will be killed along with his wife and daughter.