Riverside, Wyoming. October 1963. Little Emily, daughter of 2 poor peasants, has not been herself for some time. She always draws dead people and animals, which turn out to be only the ones she kills. A famous medium, Lorraine, looked into her case and asked for the help of Father Marcus, an elderly exorcist priest who is nearing retirement. But Father Marcus has never fought such a powerful enemy until now ... he will need your help to perform his last exorcism!