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
Phyllis Calvert
Lydia Heathley
Marianne Stone
Maisie
James Donald
Michael Heathley
Muriel Pavlow
Caroline Cartier
Cyril Chamberlain
Inspector Carter
Noel Willman
Dr. Dennis Bord
Johnnie Schofield
Jim Barnes (uncredited)
Hartley Power
General Adams (uncredited)
Stanley Maxted
Prof. Adams
Patric Doonan
Brian Jackson
Herbert Lom
Dr. Alex Leon
Walter Fitzgerald
Sir Charles Craddock
Herbert Lomas
George Jackson
Marjorie Fielding
Michael's Mother
Maurice Denham
Prof. Carrington
Hal Osmond
Agent Lawson
Robert Beatty
Maj. Sam Seagram
Philip Ray
Sentry (uncredited)
Geoffrey Denton
Fisher
Caven Watson
Dr. Ferguson
John Warren
Ted (uncredited)

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