The bodies of people who have suffered gruesome deaths begin turning up around the city, each with a piece of flesh carved out. The evidence in the investigation points to the murders being the M.O. of John Kramer (Tobin Bell), who was also known as Jigsaw. The only problem? Jigsaw has been dead for over a decade.
The investigators ask themselves whether Jigsaw has a copycat, but after the bodies undergo a medical examination, they're shocked to find that the blood found under the fingernails of the victims belongs to Jigsaw. Could he really be back from the dead?