Part V of the unkillable horror franchise picks up seconds after Saw IV's bloodbath climax, revealing how the fiercely moral serial killer Jigsaw worked with an insider on the police force to accomplish his gallery of grotesque slayings. But, from the grave Jigsaw is still up to his old tricks, putting five apparent strangers through a night of evisceration in his Hellish funhouse. Fans should know the drill by now - CSI with added arggggghhhhh!