A former British Secret Service agent is persuaded to negotiate a spy exchange with Russia, only to find himself drawn into political intrigues.

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Main Cast: Robert Horton, Sebastian Cabot, Jill St. John, Dudley Foster, Clive Graham, George Roubicek, Eric Pohlmann, Eric Longworth, Eleanor Summerfield, Timothy Bateson

Director: Roy Ward Baker

Writer: Jimmy Sangster

Editor: Spencer Reeve

Cinematographer: Arthur Grant

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