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.

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.

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.

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?

A tell-all book alleges that the British government assassinated an Iranian general in the 1950s and helped topple a regime. Ordered to prevent its publication, Palfrey suspects a cover-up.

Blair is recruited by another department to investigate a suspected Soviet agent – a Czech-born woman with whom he once had an affair. But Palfrey believes the department may have hidden motives for requesting Blair's aid.

On advice from the CIA, Palfrey surveils an American aerospace engineer suspected of passing the Soviets classified information about an Anglo-American defense project. It looks like the case may unearth the mole, but can Palfrey trust the CIA?

A former British agent who defected to the Soviet Union makes an unannounced return, threatening to embarrass both countries. Under instructions to silence him, Palfrey decides to up the stakes.

A disgruntled former government official believes that double agents still work in the intelligence service—and threatens to tip off the press unless something is done. The Co-Ordinator assigns Palfrey to head him off.

A contact at the Soviet embassy informs the Co-Ordinator that one of her agents is 'playing a double game'. Since she doesn't hold this agent in high regard, the Co-Ordinator tells Palfrey to look into it—but he suspects a set-up.