I'm really amazed that there aren't more comments on this Giallo (OVERUSED TERM) from 1968. Creepy opening credits really set the mood in motion as a hooded fiend slithers around a Baroque private clinic for the mentally unstable.
Set in Norfolk, circa 1840/1870, this neat little Belgian-French-Italian flick, in my opinion, seems to have influenced those string of Harry Towers' Edgar Allan Poe adaptations that were shot in South Africa around the late 1980s/early 1990s. You remember them? They were simultaneously gaudy & Gothic and were definitely an extension to the '60s renaissance of period psycho-chillers that were spearheaded by all of those Euro shockers and Corman's E.A.P flix. But back to this film, without giving anything away, all is not what it seems and the initial denouement, or wrap up explaining all of the craziness that transpired beforehand, would later be haphazardly copied in many slice and dice movies from the slasher craze of the '70s & '80s. In other words: Very well done for it's time. Also of note: I first saw this on Creature Feature in Florida in the '80s and the print was clear as day but the only version I have been able to procure is dark and muddy. Owning it is better than not having it in my book anyway. Worth checking out for the 'Giallo' buff and of note to collectors/researchers: the version I have runs approximately 82 minutes.