After a group of telemarketers get fired by their penny-pinching boss, they take revenge by stealing the pany's list of clients to start up their own firm. In the heat of celebration and a few drinks in, they lose the phone which holds the only copy of their future costumers. While tracking the lost device on Halloween night, co-workers Amber and Will find themselves trapped in a demented drug addict's house of horrors.</p>...
吉尔·塔克（贝茜·拉塞尔 Betsy Russell 饰）向警方和盘托出竖锯事件的始末，而侥幸逃脱死亡威胁的马克·霍夫曼（科斯塔斯·曼迪勒 Costas Mandylor 饰）则向警方发出警告，势要杀掉吉尔不可。警署上下如临大敌。另一方面，自称竖锯游戏幸存者的波比·达根（肖恩·派特里克·弗兰纳里 Sean Patrick Flanery 饰）高调现身，演讲、出书、接受电视台专访、组织幸存者自救会，风光无限之时名利双收。然而波比只是一个为搏出位的骗子，他的谎话骗过了大多数人，却骗不了竖锯约翰（托宾·贝尔 Tobin Bell 饰）。一场针对波比及其团队的残酷生存游戏拉开序幕……
本片为电锯惊魂系列第七部，制作成3D影片上映。</p>...
