A dedicated, strait-laced FBI agent and a street-smart CIA agent are part of a new, clandestine taskforce charged with solving and preventing domestic terrorism in and around New York City.
A bright-eyed freshman's decision to room with a popular student leads to what starts as an exciting new friendship but gradually transforms into a subtle battle of wills.
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 T
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