- HD 1080
- Runtime: 103m.
- Status: Released
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- Languages: en
- Country: United Kingdom
- Director: Charles Crichton
- Stars: Stephen Boyd, Jack Hawkins, Richard Attenborough, Diane Cilento, Pamela Franklin
- keywords: london, england, schizophrenia, film noir, psychologist, american abroad, killer child, tv host
- Production_studio: Hubris Productions
- Slogan: The Story of a Man Searching for a Killer Who Might Be Himself!
- The The Third Secret is featured in the top rankings of 1964
- #100 in Top Drama Movies of 1964
- #34 in Top Thriller Movies of 1964
- #17 in Top Mystery Movies of 1964
A prominent London psychologist seems to have taken his own life, causing stunned disbelief amongst his colleagues and patients. His teenage daughter refuses to believe it was suicide as this would go against all of the principles her father stood for, therefore she is convinced it was murder. She enlists the help of a former patient to try to get to the truth. However, the truth turns out to be both surprising and disturbing.
