Trapped in a room with only one door and no windows. Their cell phones do not work and no one outside of the building can hear their calls for help. The group of seven people is under siege as the shape shifting creature tries to seep inside. They are picked off one by one until it is obvious that they cannot out wait this predator. A plan is hatched to retrieve the case that the creature came in to see if it holds any clue to control it or destroy it. When they finally do get the case the creature breaks through the room's barriers and they have to run a macabre gauntlet through the building to the outside world. 　　译文(2): 被困在一个只有一扇门没有窗户的房间里。他们的手机坏了，大楼外的人也听不到他们的求救电话。这七个人被包围了，因为这个变形怪物试图潜入其中。它们一个接一个地被捕杀直到它们明显无法等待这个捕食者。一个计划被制定出来，用来取回那个生物进来的箱子，看看它是否掌握了控制它或者摧毁它的线索。当他们最终拿到箱子时，那个生物突破了房间的屏障，他们不得不穿过建筑物进入外面的世界。