Returning home from a camping trip, four friends pick up a stranded motorist, who surprises them all with blast of knock-out gas. Coming to, the four now find themselves imprisoned in a decrepit house with six other strangers, and all are outfitted with a device attached at the base of the skull. Unsure what they are doing there and who is behind it all, the group is soon enlightened by video that advises them that there is a way out of the house. But the threshold they must cross is one of excruciating pain... The mechanisms they wear are for collection of chemicals naturally produced by the human brain once the vials are filled, the captives are free to go. Unfortunately for them, the only way for the body to secrete the precious fluid is to experience life-threatening pain. Plus, there is a 24-hour window in which to secure their freedom; after that, the doors are locked forever. At first, there is uncertainly, and even a botched attempt to remove the device, but a solution is devised each must submit to a torture session until all have been subjected, and the collected fluid levels rise high enough to ensure their release. In the face of torture, however, not everyone is willing to play by the newly created rules the group is ripped apart by infighting, secret alliances, double-crosses and shattering outbursts of violence. With the clock ticking down the minutes, the one for all mentality devolves...just how far will each go in order to survive? 　　译文(2): 一次露营回家，四个朋友搭载了一个被困的司机，司机用催泪瓦斯让他们大吃一【资源囤-ZiYuanTun.Com】。醒来后，这四个人发现自己和其他六个陌生人被关在一个破旧的房子里，他们的头骨底部都安装了一个装置。不知道他们在那里做什么，谁是幕后主使，这群人很快就被视频启发，视频建议他们有一条出去的路。但是他们必须跨越的门槛是极度的痛苦... ... 他们穿戴的装置是用来收集人脑自然产生的化学物质，一旦瓶子装满，俘虏就可以自由离开了。对他们来说不幸的是，身体分泌这种珍贵液体的唯一途径就是经历致命的疼痛。此外，还有一个24小时的窗口来确保他们的自由; 之后，大门将永远锁上。起初，有人不确定，甚至有人试图移除这个装置，但是设计出了一个解决方案，每个人都必须接受酷刑，直到所有人都受到了折磨，而且收集的液体水平上升到足够高，以确保他们被释放。然而，面对酷刑，并非所有人都愿意遵守新制定的规则。这个组织被内斗、秘密联盟、欺骗和破坏性的暴力行为撕裂。时间一分一秒地过去，所有人的心态都在退化... ... 为了生存，每个人会走多远？