Diary of a Madman (film)

Diary of a Madman is a 1963 horror film directed by Reginald Le Borg and starring Vincent Price, Nancy Kovack, and Chris Warfield.

Following the funeral of Simon Cordier Vincent Price, a French magistrate and amateur sculptor, his secret diary is read out by Simons pastor friend to a group of people gathered around the table, Simons servants, and a police captain. The diary transpires that Simon has come into contact with a malevolent entity. The invisible yet corporeal being, called a horla is capable of limited psychokinesis and complete mind control.Cordier first interacts with the horla when he meets a prisoner whom the horla drove to commit murder. The horla possesses the inmate and attempts to kill Cordier, who in selfdefense accidentally kills the man. The magistrate inherits the prisoners troubles as the horla turns its hauntings toward him. ........

Source: Wikipedia