Luciano Bartoli

Deranged after a fall from a horse, a man has lived for twenty years in a castle laboring under the delusion that he is Holy Roman Emperor Henry IV. His psychiatrist concocts an elaborate scheme to shock him out of his medieval reverie.

In this Italian giallo film, a journalist finds himself on the trail of a murderer who's been targeting people around him, while the police consider him a suspect in their investigation. Stars the legendary Franco Nero (Django).