Air date: 1985-05-07

Runtime: 51 min

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.

Air date: 1985-05-14

Runtime: 50 min

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.

Air date: 1985-05-21

Runtime: 50 min

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.

Air date: 1985-05-28

Runtime: 52 min

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.

Air date: 1985-06-04

Runtime: 50 min

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?

Air date: 1985-06-11

Runtime: 48 min

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.