老鸟警探（塞缪尔·杰克逊 Samuel L. Jackson 饰）带领警探（克里斯·洛克 Chris Rock 饰）调查惨绝人寰的连环杀警案，“拼图杀人魔”重出江湖的传言，再度勾起所有人心中的恐惧。这次新的游戏规则，似乎直冲警察而来。每个命案现场留下的“死亡漩涡”，将把他们卷进难以抽身的血腥深渊之中……
《电锯惊魂》第九部由第8部的两位编剧皮特·古德芬格和乔什·斯托伯格撰写剧本。执导了《电锯惊魂234》的达伦·林恩·鲍斯曼此番回归执导。
海伦（斯蒂芬妮·莱昂尼达斯 Stephanie Leonidas 饰）从小在马戏团长大，可是身边那些让所有孩子兴奋的事物却只能让她感到厌倦，她想逃离这种不真实的生活，因此和父母发生冲突。不幸接踵而至，先是妈妈（乔安妮·坎贝尔 Joanne Campbell 饰）在表演中倒下，住进医院，接着父亲透露马戏团经营陷入危机。心怀压抑和愧疚的海伦进入一场梦境，那里由光明女皇和黑暗女皇同时统治，但是光明女皇病倒了，世界的平衡被打破，海伦受托去寻找“镜面具”，以拯救这个梦中世界。在小丑瓦伦丁（贾森·巴瑞 Jason Barry 饰）的陪伴下，海伦踏上寻找“镜面具”的路途，似乎只有先拯救梦境，才可以拯救现实……
There isn't much crime in Stoneleigh, Massachusetts, a college town, a mountain getaway for the quietly rich. So when Edward Inman, owner of Stoneleigh Sentinel security, gets a late-night alarm from the home of one of his wealthiest clients, Doyle Cutler, he does a routine check and thinks nothing more of it—until a local student claims that she was sexually assaulted that night at Cutler’s house.
Edward soon finds himself drawn into the girl's story, and his investigation leads him to his old girlfriend, whose teenage son may know the truth about what happened that night. Security is a timely, wry, and riveting story of adults and children, secret lives and civic culture, suspicion and sexual hysteria.
