Villa Ada is a 450-acre park towards the north of Rome. Once the residence of the Italian royal family, it is now open to the public. But in Let the Games Begin, a megalomaniac businessman has bought the land and turned it into a safari park. Then he decides to hold the most spectacular housewarming party the world has ever seen.
Saverio Moneta, leader of a Satanic sect, is equally determined to make the party unforgettable. He has botched his previous attempts at demonic activity and his followers are down to three. If he wants to maintain his position as leader, he has to do something truly diabolical. When he hears that the religious singer Larita will be performing at the party, he makes a plan to sneak into Villa Ada, kidnap the singer and sacrifice her to Satan.