A group of tourists get stranded at a creepy castle for the night. As the night passes, evil succubus Lisa (Blanc) knocks them off one by one, as payment for their sins and transgressions.

To clearly demonstrate that they're being killed for their mortal crimes, each one is killed by Blanc in a manner symbolizing one of the Seven Deadly Sins.

Downside? The plotting is incoherent at times, and the symbolism heavy handed.

But with a colorful cast of characters, this is truly a fun watch, mainly due to the presence of vampy sexpot Blanc (who appeared in other genre efforts such as Mario Bava's Kill, Baby, Kill in 1966, and Emilio Miraglia's Night Evelyn Came Out of the Grave in 1971).

Also known as The Devil Walks at Midnight and Succubus. For those of the right mind, this can be quite fun.

French title: La Plus Longue Nuit du Diable. Italian title: La terrificante notte del demonio.