Saw III

After being imprisoned in the bathroom, Detective Eric Matthews breaks his foot with a toilet lid to escape. Six months later, the scene of a Jigsaw game is discovered by Officer Daniel Rigg's SWAT team. The victim, Troy, had to rip chains from his body to escape a bomb. Detective Allison Kerry points out that the room's exit was welded shut, breaking Jigsaw's modus operandi of allowing his victims an opportunity to survive. Kerry is abducted and awakens in a harness hooked into her ribs. She retrieves the key from a beaker of acid as instructed, but opening the lock does not keep the trap from killing her. Dr. Lynn Denlon is abducted from the hospital she works at and brought to the now bedridden John Kramer. His apprentice, Amanda, locks a collar armed with five shotgun shells around Lynn's neck that is connected to John's heart rate monitor and will detonate if she moves out of range or John dies. Lynn is instructed by Amanda to keep him alive until another test subject has completed his game; the victim, Jeff, a grief-stricken father who was consumed with vengeance after the death of his son Dylan in a drunk driving crash years earlier, must undergo a series of tests at an abandoned meatpacking plant to confront those involved in the case. Jeff's first test leads him into a meat freezer where he finds Danica, the only witness to the crash (who refused to testify in court), completely naked and chained to a metal frame inside the plant's freezer, with nozzles inside the frame spraying her with water to quicken her hypothermia. Jeff retrieves the key after Danica persuades him to help her, but she freezes to death before he can do so. In his next test, Judge Halden, who passed a lenient sentence on the driver who caused Dylan's death, is chained at the neck to the bottom of a vat. Rotting pig carcasses are dropped into a grinder that slowly fill the vat until Jeff saves him by burning Dylan's belongings in an incinerator to retrieve a key. His third test involves Timothy, the driver who killed Dylan, who is strapped to a machine that will slowly twist and snap his limbs and then his head. The key is tied to the trigger of an enclosed shotgun that goes off after Jeff retrieves it, killing Halden. Jeff cries out twice that he forgives Timothy, but even so, he cannot save him in time; the machine twists and breaks Timothy's neck. Lynn is forced to perform an improvised surgery to relieve pressure on John's brain. The surgery is successful, and Lynn convinces John to order Amanda to remove the collar. However, Amanda refuses and threatens Lynn's life, having become jealous of her interactions with John. John pleads with Amanda, who admits that she no longer believes in his philosophy and had rigged Troy and Kerry's traps, making them unbeatable. Refusing to listen to John's warnings, Amanda shoots Lynn just as Jeff arrives. Jeff, who is revealed to be Lynn's husband, retaliates by shooting Amanda with a gun provided by John after his tests. As Amanda dies, John reveals that Lynn's test was actually hers: John was aware of her motives and unwilling to allow a murderer to continue his legacy. He then addresses Jeff, offering to call an ambulance for Lynn if he has learned everything from his ordeal, and accept one last test: either killing John or forgiving him. In response, Jeff slashes John's throat with a power saw, activating Lynn's collar as the room is sealed shut. Before dying, John takes out a tape recorder to inform Jeff that his daughter, Corbett, is also captured and no one but him knows where she is being held.