AllMovie

Set in 1902 in an Irish island castle, actually the same Italian castle masquerading as an English one in 1967's Assassino Senza Volto, Giacomo Rossi Stuart stars as Count Marnak, who invites a traveling theater troupe to stay at the castle as his guests. Marnak soon becomes obsessed with the troupe's beautiful star, Evelyn (Patrizia De Rossi), who looks enough like his deceased wife to be her identical twin, and the two begin a passionate affair. There are several of those affairs going around for the viewer's voyeuristic benefit, including the standard faux-lesbian scene, but they are soon brought to a halt as many of the participants' heads get cut off by an unseen killer. Rumors of vampirism and unintentionally humorous attempts at Gothic atmosphere are quickly forgotten in favor of the usual red herrings and butchery, leading to the unmasking of a deranged psychopath.