Jean Duprey and his wife Danielle are famous journalists with a special interest in unsolved mysteries. They receive a request of help by an old noble friend of Jean, Guillaume de Saint Lambert, who is about to die by an unknown illness. He lives, obviously, in ancient castle with his wife and the servants. Soon Duprey discover that his friend's wife is a witch (originally burnt in the 18th century) and that Guillaume is under her wicked influence. She practices the art of black magic and by making die slowly all members of the Saint Lambert family she gains eternal beauty. When Duprey breaks the marble casket containing the ashes of the witch she shows her real aspect before dying.

Pierre Brice
as Jean Duprey

Patrizia Viotti
as Danielle Duprey

Angela De Leo
as Rita Lernod

Antonio Pavan
as

Alessandro Tedeschi
as Prof. Berry

Mario Carra
as Guillaume de Saint Lambert

Daniela D'Agostino
as

Irio Fantini
as

Carla Mancini
as