圣诞节本应是和平与家人团聚的欢乐时光。但是，当马特和妻子凯伦不约而同地出现在他疏远的兄弟史蒂夫家中庆祝节日时，迎接他们的却是一个可怕的惊喜：被困在地下室里的是一个男人。但不是普通的男人。史蒂夫认为，他的人质正是魔鬼本人。
Christmas is supposed to be a time for peace and joyful family res. But when Matt and his wife Karen show up unannounced at the home of his estranged brother Steve to celebrate the holidays, they are instead greeted with a horrifying surprise: trapped in the basement is a man. But not just any man. Steve believes that his hostage is none other than the devil himself.