Sci-Fi Mystery
A secret jet aircraft capable of traveling three times the speed of sound is being developed by a group of scientists. On the day of the test flight, one of the scientists dies in a mysterious accident, and there are many arguments concerning the flight itself; some think it should be ground-controlled while Heathley (James Donald) wants it to be a manned flight with himself at the controls. Conflict also arises when one of his fellow scientists, taking advantage of Heathley's lack of attention toward his wife, Lydia (Phyllis Calvert), makes some moves on her. Then there is the question of just who is the enemy agent on the project.
Directed by
Anthony Asquith
Written by
John Pudney
Herbert Lom
Dr. Alex Leon
Muriel Pavlow
Caroline Cartier
Robert Beatty
Maj. Sam Seagram
James Donald
Michael Heathley
Maurice Denham
Prof. Carrington
Phyllis Calvert
Lydia Heathley
Marianne Stone
Maisie
Noel Willman
Dr. Dennis Bord
Cyril Chamberlain
Inspector Carter
Walter Fitzgerald
Sir Charles Craddock
Philip Ray
Sentry (uncredited)
Marjorie Fielding
Michael's Mother
Hal Osmond
Agent Lawson
Patric Doonan
Brian Jackson
Herbert Lomas
George Jackson
Hartley Power
General Adams (uncredited)
Johnnie Schofield
Jim Barnes (uncredited)
Stanley Maxted
Prof. Adams
Geoffrey Denton
Fisher
Caven Watson
Dr. Ferguson
John Warren
Ted (uncredited)

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