After inheriting an abbey in Spain, a widow with two children was renovating the building when her son became possessed by the devil, who immediately demanded that a priest be brought to him. The famous exorcist Gabriel Amorth, acting on a mission from the Pope, sets out to save the boy and, upon arrival, immediately realizes that he is dealing with a very powerful and cunning demon.

Armando Andreoli, a well-known engineer of almost 80 years, is approached by Federica, an assistant nurse who then invites him to his hotel room. In the morning, Federica's boyfriend arrives in the room, suspecting a relationship that has never existed.