- A group of tourists traveling on a bus take a detour to stay overnight in a castle owned by a family cursed with a history of Satanism and death.
- Undoubtedly, evil comes in many forms. With this in mind, the unholy stain of a silent, irrevocable curse weighs on the eerily vacant castle of the former World War II German general, Baron von Rhoneberg. For decades, a dark pact has been keeping the baron alive; however, now that a group of seven unsuspecting tourists has ended up in the ancient, memory-laden mansion of evil, unseen forces set in motion a bloody ballet of temptation, human weaknesses, and sin. Now, a mysterious, beautiful enchantress takes over, taking great pleasure in toying with the doomed visitors' unspoken desires. But Satan has all the time in the world. Is there an escape from the Devil's longest night?—Nick Riganas
- In 1945, in Berlin, the wife of Baron von Rhoneberg dies in the delivery and he stabs his newborn daughter to death. In the present days (1971), the tourist guide and driver of a bus Ducha finds a road closed and is forced to take a detour. He seeks a place to spend the night and a man on the road tells that Baron von Rhoneberg is a great host and they may stay in his castle. They are well received by his butler Hans and they go to their rooms. The grump Mason; the seminarian Alvin Sorel; Nancy and her unfaithful husband Howard; and Corinne and her friend Regine meet to have dinner with the Baron and they learn that his family has a curse and the first-born daughter of each generation turns into a succubus. Further, this day is the anniversary of the curse, but the guests believe it is a legend. Out of the blue, the beautiful and sexy Lisa Müller arrives in the castle and joins the group to have dinner. Soon a succubus appears to steal the soul of her victims for the devil.—Claudio Carvalho, Rio de Janeiro, Brazil
- In the 12th century, Sigfried von Rhoneberg signed a pact with the Devil. Along with Rhoneberg's soul, Satan demanded that the eldest daughter of each generation serve him as a succubus. For this reason, the current Baron von Rhoneberg [Jean Servais] killed his firstborn daughter in hopes of stopping the curse. Unknown by the baron, however, his dead brother Rudolph also fathered a daughter with the maid.
A tourbus of six [each representing a Deadly Sin]-- seminarian Albin Corvelle [Lorenzo Terson?], rich Mr [?] and Mrs [Colette Emmanuelle] Foster, cynical old Mr Mason [Lucien Raimbourg?], and two pretty girls, Regine [Shirley Corrigan] and Corinne [Ivana Novak] -- plus the ever-hungry tourguide Matt Ducard [Christian Maillet?] are forced to take refuge at the Rhoneberg castle after the road is blocked and a storm threatens. The are joined shortly after arrival by the maid's beautiful and lascivious daughter, Lisa Muller [Erika Blanc]. During the long night, Lisa leads all the tourists one by one to their deaths. Gluttony Matt Ducard chokes on a glass of wine, greedy Mrs Foster falls into a quicksand of gold, Mr Foster (envy?) is guillotined, promiscuous Corinne is impaled in an iron maiden, a snake gets slothful Regine, and Lisa pushes cynical Mr Mason from a tower window to be impaled below on a wrought iron fence. Only the seminarian, Albin Sorelle, seems immune to Lisa's seductive charms. When all six tourists are dead, Satan [Daniel Emilfork] calls on Albin. In his prideful belief that he can outwit anyone in a game of chess, Albin makes a deal with Satan--he offers his soul if Satan will return the dead tourists to life. Satan agrees. The next morning, everyone wakes up as though nothing happened. Even Albin remembers it only as a dream.
Unfortunately, the baron is wounded that morning in a fencing accident with Hans the butler [Jacques Monseau]. Albin chooses to remain at the castle while the tourists go on. As Albin and Lisa watch the tourbus heading back to the main road, the bus suddenly swerves to miss a funeral wagon (driven by Satan) and goes over a cliff, killing everyone aboard. Albin enfolds the luscious Lisa in his arms, and Satan smiles. [Original Synopsis by bj_kuehl.]
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