More and more, Regan, the otherwise happy twelve-year-old daughter of the successful actress, Chris MacNeil, is showing signs of erratic and disturbing behaviour, after an ill-advised contact with the supernatural. As a result, as the situation is rapidly getting out of hand, with perfectly healthy Regan becoming increasingly violent and obscene, desperate Chris is willing to do everything in her power to keep her child safe, including seeking spiritual help. Now, Chris' only hope rests on the inexperienced Greek-American Catholic priest, Father Damien Karras, and the weary exorcist, Father Lankester Merrin, to perform the intricate purification rite that will rid Regan of the malevolent spirit that is tormenting her. But, can they confront the embodiment of evil?
