影片讲述的是一位新妈妈 Mary （克里斯蒂·柏克 饰）保护新生儿 Adam（Grace Christensen 饰）的故事。Mary 生了一对双胞胎，但其中只有 Adam 存活了下来。在照顾 Adam 的过程中她疯狂地认为有某种超自然的实体在不惜任何代价地把 Adam 从她身边带走。

It tells the story of a woman who must save her unborn child and herself when she is possessed by a powerful ring.

Eighty people from totally diverse backgrounds suddenly find themselves in an undisclosed location where they are expected to compete in a race with simple rules, "If you are lapped twice, you die. If you step off the path, you die. Race… or die."　　Many will start but only one may cross the finish line alive. Eighty individuals are chosen by an anonymous being, who instantly dis...