On the hunt for the twisted vigilante and serial killer Jigsaw (Willem Dafoe), Detective Eddie McGuire (Noah Emmerich) and his team must apprehend the elusive murderer to rescue eight people trapped in an abandoned house, before they succumb to his torturous and murderous games. One twist to this task is that McGuire' own son, Darren (Eric Lloyd), is among the eight people Jigsaw has chosen to test for their lack of morality. With nerve gas pumping through the house, every second counts.