Dr. Cliff Mitchell
Marshall Thompson
Dr. Cliff Mitchell

A physicist finds himself drawn into an investigation to track down a spy at his research station.
Dr. Cliff Mitchell
Marshall Thompson
Dr. Cliff Mitchell
Major Anderson
John Loder
Major Anderson
John Manning
Henry Oscar
John Manning
Dr. Warren
John Stuart
Dr. Warren
Jill Warren
Anne Aubrey
Jill Warren
Ruth
Magda Miller
Ruth
Waldo
Murray Kash
Waldo
Tony Norwood
Michael Mellinger
Tony Norwood
Dale
Robert MacKenzie
Dale
Charles
Tom Bowman
Charles
Syms
Peter Elliott
Syms
Inspector
Bernard Archard
Inspector
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