故事发生在新奥尔良，这里是犯罪者们的天堂。西恩（强尼·斯特朗 Johnny Strong 饰）是一名嫉恶如仇经验丰富的警探，他的儿子在一场意外之中不幸死去，妻子亦因此而选择了离开，几乎是在霎时间，西恩失去了重要的一切。西恩将所有的仇恨都算在的犯罪分子们的头上，在工作中，他的作风更加暴力武断，对对手毫不留情，因此屡屡遭到投诉，濒临被停职的边缘。...
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>...
电视台制作人杰瑞•哈尔福德与信心满满的青年兰斯•普雷斯顿（辛恩·罗格斯 Sean Rogerson 饰）合作，制作了一档名为《墓地邂逅》的灵异纪实节目，他自称年少时曾遭遇超自然现象，所以长久以来一直致力于揭示灵魂的真面目。此次，他和他的团队来到了一家始建于1893年的医院——科林伍德精神病院，该医院曾受纳上千名病患，1963年因闹鬼被迫关闭。兰斯团队决定将自己反锁在医院8小时，通过摄像机以及其他高精仪器寻找鬼魂的蛛丝马迹。
为了制造恐怖氛围，兰斯不惜弄虚作假，可是他很快发现这座医院真的有什么东西存在，他们将面临最为恐怖与难熬的不眠之夜……...
At the beginning of the movie a pharmacist receives an anonymous letter that threatens him of death. And the murder actually happens. Seems very simple but nothing is what it seems and the journey to the truth will be long and difficult. The book is excellent and the movie is at par with it and very faithful to the romance. Great direction. Incredible cast with Gabriele Ferzetti in his best interpretation together with the one in "C'era una volta il West" and Gianmaria Volonté simply beyond reach as always. Many other great actors. Yes I am an enthusiast 'cause there's not a word or a shot out of place in this movie and the plot is ingenious. Who is going to see this film for the first time will be taken away by the developments (the pace seems to be calm but looking in between the kinks you may realize that many things are going rapidly on). Trying to figure out what is the kernel of the happenings and the "reasons" for the murder is a very interesting exercise but it's highly unlikely for the spectator not to experience a big surprise at the end. In my opinion Elio Petri at his best (I mean at the same level of his other masterwork: La classe operaia va in Paradiso).</p>...
