For God so loved the world he gave us monsters.
Helping his angry daughter find her missing husband, Monk and his girlfriend Agnes keep coming across carefully murdered believers as they cross the country on their way to a small isolated religious sect in western Oklahoma. A follower in the church mirrors Monk's movements as they travel, threatening violence if Monk interferes. God is always watching he tells Monk. But Monk knows god can be fickle when it comes to earthly souls and foolish believers.
When they learn the missing husband is involved in the killings and is in contact with his daughter, he and Agnes realize they might be in over their heads, and next.