Balance of Terror

Harry Radcliff, a young British officer, sets out alone on a dangerous secret mission. He is to travel to Berlin and gain the confidence of Soviet agents by pretending to be traitor to England. But Radcliff finds himself in serious trouble when he misses an appointment with an important enemy contact. In desperation, he seeks aid from his friend Mike Fenby of the British Diplomatic Office in Berlin.

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S10E18 - The Laughing Willow