The Third Secret (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.
Charles Crichton
Stephen Boyd, Jack Hawkins, Richard Attenborough, Diane Cilento, Pamela Franklin, Paul Rogers, Alan Webb, Rachel Kempson, Peter Sallis, Patience Collier, Freda Jackson, Judi Dench, Peter Copley, Nigel Davenport, Charles Lloyd Pack, Barbara Hicks, Ronald Leigh-Hunt, Geoffrey Adams, James Maxwell, Gerald Case, Sarah Brackett, Neal Arden
tt0058649