Vera Farmiga and Patrick Wilson are back in their roles as the married couple. And they're investigating one of the most sensational cases from their files. It starts with a fight for the soul of a young boy, then takes them beyond anything they’d ever seen before. Their case marks the first time in U.S. history that a murder suspect claimed demonic possession as a defense. The trailer opens with a man walking down an empty street. A policeman pulls his car over, steps out, and asks, "You okay there?" When the man turns around, we see he's covered in blood.