The plot of the American dramatic thriller series "The Exorcist" unfolds within a Catholic church, where a conspiracy is taking place. Two priests, belonging to different districts, each resist the evil forces in their own way. A young girl named Reagan Rance is possessed by a demon. Her mother, Angela, asks local priest Thomas Ortega to help her daughter. Soon, Thomas realizes that the demon is also taking hold of his own consciousness. He turns to his colleague, Marcus, for assistance.