A smug executive enjoys the perfect life - until he loses his job, and finds himself working at a burger joint. Now he's falling behind on his bills, and if something doesn't change soon, his family could lose everything by Christmas.

On a cold winter's night, William and his teenage son, Jake, enter a run-down house in a desolate section of a North-American city. Once inside, they find Mathilde, a desperate single mother who needs their help to save her daughter suffering from demonic possession.