这部影片讲述的是没有任何缘由也没有尽头的杀人游戏，两个毫不相识的男人被锁在卫生间里，并接连被砍腿也遭受了其他折磨。

亚当从昏迷中苏醒发现自己被锁在破旧的地下室。在不远处同样被锁着另外不知所措的人，是劳伦斯医生。二人中间地板上有一名死去很久的男子，身上满身血渍，手中也握着一把手枪。那当与劳伦斯两人根本不知道自己究竟何时来到这个地方就在疑惑之时，屋内有一个遗留的录像带自动播放，声带中命令劳伦斯需要杀掉亚当并在8小时之内，否则就会将劳伦斯的妻儿杀死。

此时二人明白，在当地警察局景泰泰普最近调查谋杀案并意识到成为了外号，是数据变态杀人魔的玩具也即将成为下一个被害者。在短短的几个小时时间内必须克服困难并找到给逃脱的线索。能够逃离的线索，只剩下地上两把不起眼的手锯。首句是无法锯断铁链的，却能够割碎一个人的骨头与血肉。

This movie is about a murder game without any reason or end, two men who don't know each other are locked in the bathroom, and one after another His legs were cut off and he suffered other tortures.

Adam woke up from a coma and found himself locked in a dilapidated basement. Not far away, another person who was also locked and at a loss was Dr. Lawrence. On the floor between them was a long-dead man, covered in blood and holding a pistol in his hand. When Lawrence and Lawrence didn't know when they came to this place and were wondering, there was a leftover video tape in the house that played automatically, and the soundtrack ordered Lawrence to kill Adam within 8 hours, otherwise he would die. Kill Lawrence's wife and children.

At this time, the two understand that Jingtaitaipu, the local police station, recently investigated the murder case and realized that it became a nickname. The perverted killer's toy is about to become the next victim. In just a few hours you must overcome difficulties and find clues to escape. The only clues to escape are two unremarkable handsaws on the ground. The first sentence cannot saw off the iron chain, but it can cut a person's bones and flesh.