While investigating the bloody aftermath of a grizzly murder, Detective Eric Mason has the feeling that it is the work of Jigsaw, the notorious killer who disappeared leaving a trail of bodies - and parts - behind. And Mason is right. Jigsaw is at work again. But instead of two people locked in a room with only one unthinkable way out, there are eight. Eight strangers -- unaware of their connection to each other -- forced to play out a game that challenges their wits and puts their lives in jeopardy.


电影背景：

　　在对一件恐怖的谋杀进行调查时，梅森侦探意识到，那个臭名昭著的杀手“竖锯”又开始他那令人闻风丧胆的杀人游戏了。但是这次他变本加厉，把八个互不相识的陌生人锁在一个房间里，逼迫他们自相残杀……