自从埃伦•莫里丝(Blythe Metz 饰)收到一个非洲风格的面具之后,她的生活就充满了恐慌。她声称经常受到“夜魔人”的袭击,但她的丈夫威廉姆(Luciano Szafir 饰)和心理医师都认为埃伦精神出现了问题。 某天夫妻前往医院的途中,汽车突然抛锚。在威廉姆寻求帮助离开后不久,夜魔人突然出现,对埃伦展开无情追杀。仓皇之中,艾伦逃入一幢别墅,别墅内的夫妇对埃伦的说此感到怀疑,但身边的人却一个接一个死去,那个恐怖的夜魔人莫非真的存在?After receiving an African fertility mask as a gift Ellen tells her husband William that she's been attacked by masked phantom called 'the Nightmare Man'. As Ellen's paranoia increases, William takes Ellen for a road trip to a clinic, only to have their car break down, and when William goes off, Ellen is attacked for real by the Nightmare Man. Fleeing through the dense woods, Ellen seeks shelter in the remote cabin home of Mia, with her friends Jack, Ed, and Trinity, who give her shelter, but are soon besieges in their home by Nightmare Man. But the real horror comes when Ellen slowly reveals to harbor a MORE evil and deadly thing within her which could spell death for everyone involved.