SAW

A man named Adam wakes up chained to a rusty pipe inside a decrepit subterranean chamber. On his side, is another person chained, Dr. Lawrence Gordon. Among them there is a dead man with a 38-calibre revolver in his hand. Neither know they are there; just have a tape with instructions that says Dr. Gordon must kill Adam in eight hours. If it fails, both will die, along with the wife of Dr. and her daughter.

Recalling an investigation of murder carried out by a detective named Tapp, Dr. Gordon discovers that he and Adam are victims of a psychopath known as Jigsaw. They are only a few hours to unravel the complicated puzzle in which they are immersed. The murderer has left him only a few clues and two handsaws too weak to cut the chain that binds, but too strong to cut flesh and bone.

Following the instructions, Adam and Dr Gordon trying to lay Jigsaw making believe that Adam died poisoned with a cigarette, as stated in the instructions, but feel electric shocks who makes them understand that everything is very well controlled. David, a fellow of the hospital Dr. Gordon also is a victim of this game, he is who has to check that everything goes well between Adam and Dr. Gordon, The eight hours end and the time to them finish and David is going to kill the wife of Dr. Gordon and her daughter, is there when the detective helps them and prevents his death, David decides kill to Adam and Dr. Gordon in the bathroom, but in the meantime Dr Gordon desperate makes a shoot to Adam and cut his skin to escape, is when David comes to kill them, but they kill him with blows to the head, that's when Dr. Gordon may flee crawling and promises to Adam returned to rescue him.

But what nobody expected, the body surrounded by blood, which remained all the time between them, gets up, and shooting to Adam, it was the psychopath Jigsaw