Jess Franco's first major film is an atmospheric, well-photographed, amazingly lurid little masterpiece that deserves serious attention from horror fans. The brilliant, cacophonic jazz score and unusual camera angles work to create a real feeling of menace, and there's rich attention paid to period detail, and eerie lighting. The English version is even well dubbed. This was a big hit for Franco, and he followed it with a sequel, DR. ORLOFF'S MONSTER, in 1964.