The carefree holiday of a young couple is upset by an unexpected meeting with a vagrant who persuades the girl (Roberta Gemma) to accept an old wooden box as a gift – when she later opens it she finds it contains an antique jewelled medallian which she puts on.The medellian is cursed and brings Roberta under the evil influence of a satanic cult and their charismatic leader who slowly draws out and exploits Roberta’s dark sexual nature.