Well made and effective tale based on "The Horla" where Price is a Paris magistrate who becomes besotted with the future Mrs. Zubin Methta (Nancy Kovack). Unfortunately, she is already married to future (under a pseudonym) porn film writer and director Warfield--who probably made a good career choice. Nice ending, even if there is absolutely nothing in the film that convinces you that anyone is French or has even heard of France. ( )

Loosely based on a story by Guy de Maupassan, this is a surprisingly good, if little known Vincent Price vehicle. The screenplay by Robert E. Kent has Price in the role of Simon Cordier, a respected magistrate with an interest in the criminal mind and in particular what drives a man to murder. When he interviews a condemned murderer the man relates a fantastic story of possession courtesy of an entity known as the Horla. Soon after the interview Cordier begins to feel odd and begins to hear a voice in his head that makes him question his sanity. When he meets the beautiful, but married gold-digger Odette (Nancy Novack) he begins a romantic relationship, but unfortunately he has soon to admit to himself that he's in thrall to the murderous Horla. "Diary of a Madman" is an entertaining little horror mystery full of nice touches and good acting despite a conspicuously cheap look. The story lacks the ambiguity it should have around whether Cordier is actually mad or whether he's possessed, but despite that the overall concept still works reasonably well. Director Reginald Le Borg shoots on a limited set, which probably explains the static nature of the "action", but he still manages a few decent flourishes that keep the interest all the way through. Vincent Price is his normal impeccable self and has good support from those around him, even if some of them are pretty stiff and wooden. Nancy Novack is beautiful to look at and puts in a marvellously greedy performance full of avarice and more than a touch of subtle sexual suggestion. In summary then "Diary of a Madman" is an interesting, if somewhat typical, slice of early '60s psychological horror. It has a nice (if cheap) look, a decent story, some nice atmospheric touches and in Vincent Price, the consummate, honey-voiced horror performer. ( )