A physicist finds himself drawn into an investigation to track down a spy at his research station.

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Main Cast: Marshall Thompson, John Loder, Henry Oscar, John Stuart, Anne Aubrey, Magda Miller, Murray Kash, Michael Mellinger, Robert MacKenzie, Tom Bowman

Director: Ronald Kinnoch

Writers: Brian Clemens, Ronald Kinnoch

Editor: Peter Mayhew

Cinematographer:

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