This movie stars Klaus Kinski, paying the gas bill, and about 11 other people of whom I have never heard before or since. The asylum is reserved solely for the treatment of young, attractive female patients (the medical reasoning behind this policy is, sadly, never addressed) so one nymphomaniacal patient is obliged to make use of the services of the gardener.
A murderer intrudes upon this less-than-idyllic scenario, wearing a hooded cloak at dead of night and muttering, grunting and breathing heavily while he roams the grounds and corridors. He is surprisingly good at coming across young, attractive female patients while they are (a) naked and (b) alone.
The source of his murderous weapons? A display of swords, daggers, spears and a crossbow which are tastefully arranged on the wall of the asylum lobby, next to a WORKING MODEL of an Iron Maiden. I mean you just wouldn't, would you? Weaponry to decorate the asylum walls? A good enough reason to incarcerate the interior designer, one can't help feeling.