This seedy but effective little supernatural thriller involves a group of seven travelers -- each of whom represents one of the Seven Deadly Sins -- who take shelter in a mysterious baron's haunted castle, where they are visited in turn by a seductive, lingerie-clad succubus (Erika Blanc), who metes out suitable punishment in accordance with their evil deeds. It is revealed that their enigmatic host is a former Nazi general whose family's Satanic legacy includes the birth of a malevolent she-demon into each generation. Only the token priest of the group manages to stand up to the evil forces. A Belgian/Italian co-production; also released as The Succubus, The Devil's Longest Night, Castle of Death and The Devil Walks at Midnight.
~ Cavett Binion, All Movie Guide