Father Tomas Ortega is the new face of the Catholic Church and runs a small parish in the Chicago suburbs. He lives a quiet life that is about to unexpectedly change forever.

Father Marcus Brennan is a modern-day Templar Knight, raised by the Vatican since childhood to wage war against its enemies. He is the polar opposite of Father Tomas: relentless and devoted to his sacred mission.

Caught in the middle is the Rance family, who are members of Father Tomas' parish. They may appear like any other suburban family, but all is not as it seems within the walls of their household. Patriarch Henry is losing his mind and his wife has recurring nightmares. His daughters are reclusive and hear noises inside the walls.

With a demonic presence in their house appearing to grow stronger each day, they appeal to Father Tomas for help, which sets the naïve priest on a collision course with Father Marcus. Separately, each priest faces an insurmountable task, but together they act as the only hope against this evil force.