Traitors

Spies work behind the scenes as the superpowers enter a new era. Intelligence pushes world leaders towards a more peaceful approach. But a new danger is lurking in the shadows.

With Gordievsky's help, Britain identifies Mikhail Gorbachev as a possible new contender for Soviet leader; he could be the ticket to better relations between East and West. But fragile steps towards diplomacy are threatened by the vested interests of other spies still stuck in the old-world order.

The CIA is determined to identify Britain's superspy, but Soviet counterintelligence chief Aldrich Ames is disillusioned. He turns traitor for a paltry sum, and shortly afterward, Gordievsky is summoned back to Russia to almost certain danger.

The episode includes exclusive audio recordings of Aldrich Ames, audio interviews with Oleg Gordievsky, interviews with former KGB, FBI, CIA, and MI6 officers, some of whom have never spoken before, and colleagues of Thatcher and Reagan.