The podcast episodes provided cover various aspects of Cold War espionage, including the operations and rivalry between British and Soviet intelligence agencies, the treachery of double agents, and the personal struggles of spies caught between conflicting loyalties.

Examples of episodes that explore this topic include How the Cambridge Five Changed MI5, The Spy Who Saved MI5, and Jack Barsky: KGB Spy, which delve into the Cambridge Five spy ring, the Oleg Lyalin defection, and the firsthand account of a KGB agent operating in the United States.

These episodes showcase the high-stakes world of Cold War espionage, where national security, political tensions, and personal sacrifices intersected in a complex web of secrecy, betrayal, and the constant struggle between East and West.