Saw II

Police informant Michael Marks awakens in a room with a spike-filled mask locked around his neck. Michael has one minute to cut into his eye to obtain the key, but can't bring himself to do it and is killed when the mask closes. At the scene of Michael's game, Detective Allison Kerry finds a message for her former partner, Detective Eric Matthews, and calls him in. Matthews joins Kerry and Officer Daniel Rigg in leading a SWAT team to the factory which produced the lock from Michael's trap. There they apprehend John Kramer, the Jigsaw Killer, who indicates computer monitors showing eight people trapped in a house, including his only known survivor Amanda Young, Matthews' son Daniel, and six other victims: Xavier, Jonas, Laura, Addison, Obi, and Gus. A nerve agent filling the house will kill them all within two hours, but John assures Matthews that if he follows the rules of his own game, he will see Daniel again. At Kerry's urging, Matthews agrees to buy time for the tech team to arrive and trace the video signal. During their conversation, John reveals to Matthews that one of his main motivations to become Jigsaw was a suicide attempt after his cancer diagnosis, which led to a newfound appreciation for life; his games' purpose is to help his victims develop the same appreciation.