The Sleep of Death (1980)

In early 19th-century Europe, a young English gentleman travels seeking adventure, culture, and possibly romance with the upper class. He meets Countess St. Alyre, an alluring woman who charms him. But as he explores high society, a darker side appears. The mysterious Marquis D'Armanville and other strange people create an atmosphere of suspense. When baffling murders begin, the protagonist struggles to distinguish reality from illusion. Facing constant danger, he must use his intelligence to solve the mysteries and safeguard those he values, confronting the disturbing secrets hidden within society.