1. Once Your Card Is Marked

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. 18 April 1984. 50 min

Palfrey's new boss – known only as The Co-Ordinator – wants him to nail a misfit diplomat everyone suspects is spying for the Soviets. But Palfrey believes someone is making the man a scapegoat, and he decides to find out why.

2. The Honeypot and the Bees

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. 25 April 1984. 49 min

A senior official at the Ministry of Defence is carrying on a clandestine affair with a young woman from Czechoslovakia. When the couple vanish, the Co-Ordinator fears a serious breach in national security.

3. The Defector

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. 1 May 1984. 51 min

The Co-Ordinator calls a press conference to announce the defection of a celebrated Russian author, but Palfrey urges caution. He suspects a trap, especially after the KGB starts to pressure for the author's return.

4. A Present from Leipzig

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. 8 May 1984. 51 min

A stolen Russian icon leads Palfrey to the door of a wealthy industrialist who makes periodic trips to the Eastern Bloc. Why did the man not report the theft? And why is a young East German visiting his home?