When several of his fellow Vatican exorcists are simultaneously killed, Father Mason Harper returns to his childhood home to spend time with childhood friend, Tanis, and await orders from the Church.

However, this small town holds dark secrets about Mason's past and the religious organization once run there by his father, Angus. Thought dead, Angus reappears, forcing a reunion between father and son. But Angus is different now, and before long, Mason suspects he’s possessed, not by the devil, but by something… holy.

When Mason attempts to exorcise the holy presence from his father, he sets off a chain of events that may end in a cataclysm of biblical proportions testing everything he holds sacred..