A Mexican teenager whose dreams of becoming a soccer star are disrupted when his mother dies. He's smuggled across the border with the promise of a better life but is instead sold to a sweatshop in do

故事设定在《电锯惊魂》第一、二部之间，患病而绝望的约翰·克莱默（托宾·贝尔 Tobin Bell 饰）前往墨西哥中止一次风险的实验手术，希望能奇观般地治愈癌症，却发现整个手术都是场骗局，旨在诈骗最弱势的群体。抱持着全新目的后，“竖锯”，这位臭名昭著的连环杀手重操旧业，末尾对付起这些骗子。