西格玛阿尔法艾普斯隆兄弟会的兄弟们正在为圣诞假期平静下来，突然一个男人用淫秽的电话打给兄弟会，并威胁要把他们都杀了，在平安夜的晚上，他会遵守诺言，一个接一个地杀死他们。
A Mysterious Intruder Breaks into a Fraternity House and begins to stalk and murder the occupants one by one, as the victims try to figure out who is behind the killings before they all become victims to the intruder.
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