Watch Diary of a Madman

After Simon Cordier dies, his diary is read to a large audience. The diary mentions Simon's interactions with a fiendish entity, the horla, which was capable of psychic powers. Simon's interactions with the creature began when a possessed inmate sought to kill him. After Simon kills the inmate, the horla turns its menace toward him.

The horla deludes Simon into believing that his sanity is quickly slipping, plaguing him with second guesses. This continues until Simon believes that a creature is responsible, luring the horla into a fire trap that results in the scenes at the start of the film.

Diary of a Madman is an Horror, Thriller movie that was released in 1963 and has a run time of 1 hr 36 min. It has received poor reviews from critics and viewers, who have given it an IMDb score of 6.4.

Diary of a Madman is available to watch and stream, download on demand at Amazon Prime, Apple TV+, EPIX, EPIX NOW online. Some platforms allow you to rent Diary of a Madman for a limited time or purchase the movie and download it to your device.