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, the third directed by Bousman. The film stars Tobin Bell, Scott Patterson, Costas Mandylor, Betsy Russell, and Lyriq Bent. Set concurrently with the events of Saw III, the plot follows Daniel Rigg, a police officer obsessed with rescuing the Jigsaw Killer's victims, who finds himself the focus of Jigsaw's latest series of tests, in which he must rescue his partners, Eric Matthews and Mark Hoffman, while learning to overcome his obsession. The film also explores John Kramer's legacy and his ability to manipulate people into continuing his work after his death, while providing more of his backstory and an additional explanation as to why he became Jigsaw.
