Simon Cordier, a French magistrate and amateur sculptor comes into contact with a malevolent entity. The invisible - yet corporeal - being, called a "horla" is capable of limited psychokinesis and complete mind control.
| Release Date | March 6, 1963 | |
|---|---|---|
| Status | Released | |
| Original Title | Diary of a Madman | |
| Runtime | 1h 36min | |
| Budget | — | |
| Revenue | — | |
| Language | English | |
| Original Language | English | |
| Production Countries | United States of America | |
| Production Companies | United ArtistsRobert E. Kent Productions | |