从野营旅行回家，四个朋友接一个被困的司机，谁惊喜他们所有爆炸的爆气。到了这四个人，他们发现自己和其他六个陌生人一起被囚禁在破旧的房子里，他们全都装备了一个贴在头骨底部的装置。不确定他们在那里做什么，谁是这一切的幕后黑手，小组很快就被视频启发，告诉他们有一条出路的房子。但是他们必须跨越的门槛是痛苦的...他们穿的机制是收集化学物质自然产生的人类大脑，一旦小瓶被填补，俘虏可以自由去。不幸的是，对于他们来说，身体分泌珍贵液体的唯一方法就是经历危及生命的疼痛。此外，还有24小时窗口，以确保他们的自由;之后，门永远锁上了。起初，有不确定的，甚至一个拙劣的尝试删除设备，但设计一个解决方案，每个必须服从酷刑会议，直到所有已遭受，收集的液体水平上升到足以确保他们释放。然而，面对酷刑，不是每个人都愿意遵守新制定的规则，这个组织被内斗、秘密联盟、双重交叉和暴力爆发而四分五裂。随着时钟滴答作响的分钟， 一个所有的心态下放...为了生存， 每个人能走多远？

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?