帕克（艾玛·贝尔 Emma Bell 饰）对男友丹（凯文·席格斯 Kevin Zegers 饰）的死党林奇（肖恩·阿什莫 Shawn Ashmore 饰）成见颇深。一日，三人结伴去滑雪，到达时滑雪场即将关门，他们买通检票员乘上了上山的缆车。检票员临时有事离去，来换班的工作人员在不知情的情况下拉掉了滑雪场的电闸，锁上大门准备离开，滑雪场即将进入为时数月的封山期，帕克一行人就这样被悬挂在半山腰上下维艰。
面对大自然的凶险，人类是如此不堪一击。天渐渐的黑了，寒冷，饥饿，随便那一项都足以置他们于死地。不知所措的三人急于脱险，但莽撞和无知却让他们伤亡惨重，此时他们才发现，除了要跟恶劣的天气作斗争外，还有一群饥肠辘辘的猎食者正虎视眈眈的盯着他们的猎物。
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