Christmas holidays on the snow of Cortina D'Ampezzo. Mario, a guy from Rome who has not much money, falls in love with the American Samantha, the girlfriend of hypochondriac Roberto. Billo, a singer and a playboy, meets Ivana: she's married with a rich man, Donatone, but in the past she had a flirt with Billo, who wants to reignite the flame.
A woman seemingly dies of fright after participating in a séance where she sees a vision of a Dunwich priest hanging himself in a church cemetery. New York City reporter Peter Bell investigates and learns that the priest's suicide has somehow opened a portal to Hell and must be sealed by All Saints Day, or else the dead will overtake humanity.
A group of students from the San Crispino school for boys take a holiday in the United States, traveling from New York to Los Angeles. Young Father Don Buro has great difficulty controlling the youngsters, especially trouble making ex-student Peo, and finds himself distracted by the attractive single mother of one of the boys.
