Paul Carpenter (Valentine 'Val' Neal)
Patricia Roc (Mary Foster)
Roland Culver (Dr Francis Pelham)
William Hartnell (Inspector Ross)
Gordon Needham (Detective Sergeant Davis)
Edgar Driver (Atkins, the porter)
Tom Tann (Wang, the houseboy)
Ellen Pollock (Miss Barbara Barton)
Robert Sansom (Senior Test Flight Official)
Martin Wyldeck (Dr Bradford)
John Serret (Dr Martin)
Oliver Johnston (Dr Kenyon)
Kay Callard (Jazz Club Blond)
Tim Fitzgerald (Val as a boy)
Mary Jones (Val's Mother)

A test pilot is injured in a plane crash, following which his fiancee takes him to a psychiatrist, who attempts to hypnotise the man into murdering his wife.