The Bloodsucker Leads the Dance (1975)

In Ireland in 1902, Count Marnak invites a troupe, four actresses an an actor to perform at his island castle. He is stunned by Evelyn, the lead actress, who resembles his dead wife. They begin an affair, but suddenly one by one, the inhabitants of the castle are turning up decapitated. The count fears that an old family curse is responsible for the grisly slayings.