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Saw IV is a 2007 horror film directed by Darren Lynn Bousman from a screenplay by Patrick Melton and Marcus Dunstan, and a story by Melton, Dunstan, and Thomas Fenton. It is the fourth installment in the Saw film series and a sequel to 2006's Saw III. The film stars Tobin Bell, Scott Patterson, Costas Mandylor, Betsy Russell, and Lyriq Bent.

Plot

An autopsy of the Jigsaw Killer reveals a wax-coated microcassette in his stomach, and Detective Mark Hoffman is told to listen to it. The tape promises him that "the games have just begun." In a mausoleum, a man named Trevor and a lawyer named Art Blank are chained to a large device. Trevor's eyes have been sewn shut, and Art's mouth has been sewn shut, making communication between them impossible. When the device begins pulling them together, they panic, and Art kills Trevor to retrieve a key from his collar.