The Third Secret (film)

The Third Secret is a 1964 British drama film directed by Charles Crichton. The screenplay by Robert L. Joseph focuses on an American newscaster who investigates the mysterious death of his psychoanalyst. According to the film there are three kinds of secrets the First Secret you keep from others, the Second Secret you keep from yourself, and the Third Secret is the truth.

Catherine provides Alex with the names of three other patients. Sir Frederick Belline is a respected judge, Alfred PriceGorham runs a prestigious art gallery with his assistant Miss Humphries, and Anne Tanner is a corporate secretary. As Alex investigates their backgrounds, he discovers each of the three, like himself, harbours a secret known only by the murdered man. Hoping to find more clues, Alex goes to the doctors country home to search his files. There he learns Catherine was under her fathers care, and when he confronts her she admits she killed the doctor when he threatened to send her to an institution to be treated for schizophrenia. While reenacting the crime, Catherine stabs Alex and consequently is confined to a psychiatric hospital. Recovered from his wound, Alex visits her and promises to stay in touch. The Third Secret the doctor had hidden from himself was the seriousness of his daughters illness, which made him delay committing her to a mental institution.Patricia Neal was cast as one of the doctors patients, but all her scenes were cut from the film before it was released. ........

Source: Wikipedia