Saw IV is the fourth installment in the Saw series. The film was initially released on October 25, 2007, and in the United States on October 26, 2007. The film's North American release date follows the series' tradition that the films be released the Friday before or on Halloween of each year. This installment continues the story of the Jigsaw Killer, and his obsession with teaching people the value of their own lives. Although Jigsaw died in the last installment (Saw III), this film focuses on his ability to manipulate people into continuing his work. Saw IV was directed by Saw II and Saw III director Darren Lynn Bousman alongside with co-creators James Wan and Leigh Whannell returning as executive producers. Unlike the previous three films, Saw IV was not written by either Wan or Whannel.

Jigsaw and his apprentice Amanda are dead. Now, upon the news of Detective Kerry's murder, two seasoned FBI profilers, Agent Strahm and Agent Perez, arrive in the terrified community to assist the veteran Detective Hoffman in sifting through Jigsaw's latest grisly remains and piecing together the puzzle. However, when SWAT Commander Rigg is abducted and thrust into a game, the last officer untouched by Jigsaw has but ninety minutes to overcome a series of demented traps and save an old friend or face the deadly consequences. Written by Lionsgate