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In this erotic horror film from cult director Jesus Franco (using the pseudonym "Clifford Brown"), wealthy businessman Patrick Mariel (Guy Delorme) takes his wife Marianne (Jacqueline Laurent) and daughter Linda (Lina Romay) on a French vacation. Patrick's old friend Lorna (Monique Delaunay, using the name Pamela Stanford) shows up just in time for Linda's 18th birthday and takes demonic, sexual possession of the girl's body and soul. Franco appears as a doctor and Howard Vernon makes a brief appearance in this plodding supernatural exploitation piece which nevertheless manages to intrigue. Despite dreadful photography by Etienne Rosenfeld and a scene involving cockroaches crawling from a woman's nether region, this perverse, incestuous, and ugly film will have some appeal to genre completists.