Saw IV (2007)

A wax-covered microcassette is found in John Kramer’s stomach during his autopsy, which contains a posthumous message from John that informs Detective Mark Hoffman that he will be tested. Elsewhere, two men – one with his eyes sewn shut, the other with his mouth sewn shut – awaken in a mausoleum, chained at the neck to a winch that begins reeling them in. The muted man is forced to kill the blinded man to get a key from his collar and free himself.

Following Detective Allison Kerry’s death in a Jigsaw “game”, a SWAT team led by Hoffman and Officer Daniel Rigg and Kerry’s FBI contacts Peter Strahm and Lindsey Perez arrive at the crime scene. Noting the physical limitations of John and his apprentice, Amanda Young, Strahm speculates that a third accomplice was involved and becomes suspicious of Rigg. That night, Rigg, who has become obsessed with rescuing Jigsaw’s victims since Detective Eric Matthews’ disappearance, is attacked in his home and later awakens to find a video from Jigsaw. The video reveals that Eric is still alive (having been saved and held captive by Jigsaw for six months after he was left for dead by Amanda), and that the only way to rescue him and Hoffman, who has also been kidnapped, is for Rigg to pass a series of trials that will teach him to let go of his obsession. If Rigg fails to pass his tests in 90 minutes, Eric and Hoffman will be killed.