The Devils Nightmare (1971)_aw

The German noble family of von Rhoneberg has been cursed for many generations.. The first-born female member of every generation is destined to transform into a succubus. The latest Baron von Rhoneberg murdered his own first-born daughter back in World War II, in order to prevent her transformation. Decades later, the Baron is interviewed by a young female reporter. He denies her permission to photograph the family castle for her article, but she performs a photo-shoot behind his back. Shortly later, the reporter is killed in a sudden thunderstorm. A group of stranded tourists are convinced by a mysterious stranger to seek shelter in the Baron's castle. A young woman named Lisa Muller also arrives at the castle. She seduces and kills each of the tourists, seemingly aware of their hidden vices and weaknesses. Lisa is the Baron's illegitimate niece and the family's latest succubus. Alvin Sorelle is the only stranded tourist who is seemingly immune to Lisa's charms. His personal sin is pride and he sees himself as better than the others. Alvin signs a deal with Satan, trying to save the souls of his traveling companions. He is successful enough to have everyone resurrected and he seemingly wins Lisa's love in the process. But shortly after this victory, the resurrected tourists are killed again in a traffic accident. And Alvin is unaware that Lisa and Satan are toying with his emotions for their own gain.