A particularly maligned example of Italian cult cinema with a nonsensical title to boot (if anything, the alternate THE MARK OF Satan is even less relevant to the plot!), this hybrid of Gothic Horror and Giallo (with a strong dose of Erotica) only contrives a flat sort of atmosphere throughout  actually matched by handling which is downright dreadful! Here, we get the usual group of people (an acting troupe) stranded on an island (to which they were invited by a Count  since he had become enamored of the leading lady, a dead-ringer for his missing spouse)! The characters are pretty much stereotypes: middle-aged but dashing hero (played by Giacomo Rossi-Stuart and whose family history bears more than its share of violent tragedy), demure heroine, sluttish companion (recalling Mae West and emerging the most annoying of the lot!), a meek but devoted stage manager (forever chided by one and all for his unmanly behavior!), a couple of lesbians, a mysterious gardener (the ubiquitous Luciano Pigozzi who, for once, gets in on the action, if you know what I mean), an envious housekeeper (nominal star Femi Benussi though, for what it is worth, this is really an ensemble piece), a religious fanatic of a butler, an impressionable chambermaid, etc. While the film is not by any means unwatchable, the atrocious dubbing, snail's pace, shoddy production (with the scenes depicting the raging sea lifted from some black-and-white film!) and the fact that the murders only occur within the concluding half-hour do not help matters. Besides, Marcello Giombini's score, though pleasant in itself, comes off as incongruously modern under the circumstances; that said, the revelation proves a surprisingly elaborate one (considering there is surely no shortage of suspects here).