A young man named Adam (Leigh Whannell) wakes to findhimself chained to a rusty pipe inside a decrepit subterranean chamber. Chainedto the opposite side of the room is another bewildered captive, Dr. LawrenceGordon (Cary Elwes). Between them is a dead man lying in a pool of blood.Neither man knows why he has been abducted; but instructions left on amicrocassette order Dr. Gordon to kill Adam within eight hours. If he fails todo so, then both men will die and Dr. Gordon's wife Alison (Monica Potter), andhis daughter will be killed. Recalling a recent murder investigation by apolice detective named Tapp (Danny Glover), Dr. Gordon realizes he and Adam arethe next victims of a psychopathic genius known only as "Jigsaw."With only a few hours left to spare, they must unravel the elaborate puzzle oftheir fate in the midst of mounting terror. The killer has provided them withonly a few clues and two handsaws - too weak to break their steel shackles, butstrong enough to cut through flesh and bone...