A now very seriously ill Jigsaw is being cared for by Amanda in his workshop. Amanda kidnaps a doctor, Lynn, to keep Jigsaw alive long enough to see another victim, Jeff, complete his 'game'. Jeff is a grieving father whose son, Dylan, was killed in a road accident. Jeff's game involves Jeff being given an amount of time to follow a trail through a factory in which Jeff meets three people, in traps, involved in his son's murder. Jeff must choose whether to forgive them or watch them die painfully for their part in Dylan's murder. The film follows the two sides to the story and also has a side plot of the relationship between Jigsaw and Amanda whilst also looking at how some of the older traps (particularly Adam's) were set up.