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.

The true story of Sam Childers, a former drug-dealing biker who finds God and became a crusader for hundreds of Sudanese children who've been kidnapped and pressed into duty as soldiers.