Saw IV is a 2007 American horror film directed by Darren Lynn Bousman from a screenplay by Patrick Melton and Marcus Dunstan. The film serves as the fourth installment in the Saw franchise, following the events of Saw III. It features Tobin Bell, Scott Patterson, Costas Mandylor, Betsy Russell, and Lyriq Bent. The narrative picks up after John Kramer's death, revealing that he had orchestrated posthumous games and left behind recordings to guide investigators. As detectives work to understand his final puzzle, they become entangled in a conspiracy that exposes deeper motivations behind his deadly tests.