Sergei Skripal is easing into retirement with a side hustle as a MI6 agent, and enjoying the Spanish seaside. Meanwhile, the KGB’s successor, the FSB, is on the hunt for traitors after a tip-off from a mole inside Spain’s intelligence service.

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When the USSR falls apart, GRU officer Sergei Skripal finds himself adrift in the new Russia, having never asked for the country's new democracy. So when he meets a shadowy wine dealer, he leaps at the chance to make some money, without a clue how the deal would lead him to Salisbury.

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Why did Fuchs take such a huge gamble by sharing US nuclear secrets with the Soviets? Was Oppenheimer's fellow physicist seeking peace - or war? Charlie Higson talks to Frank Close, an author and physicist, about Fuchs' decision and its impact on the course of history.

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MI5 is closing in on Klaus Fuchs. But they can't seem to catch him in the act of spying. There’s only one option. They need a confession.

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Klaus Fuchs is sure his espionage has gone undetected. So when authorities unearth a similar spy ring in Canada’s nuclear project, Fuchs doesn’t consider that he could be next.

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Fuchs’ plan to feed secrets to the Soviets is in jeopardy. The atomic bomb project is closely guarded. That means little contact with the outside world, especially his handlers.

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It’s the 1940s. Robert Oppenheimer is creating plans for the first atomic bomb. And his colleague is stealing them. Klaus Fuchs is a traitor in Oppenheimer's ranks. A German-born physicist secretly working for the Soviet Union. Oppenheimer will change the world with science; Fuchs with espionage.

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Why was Carlin considered Thatcher's favourite spy? What difference did he really make? And how did he cope when he became an exile?

To find out more about Carlin's life and significance, Charlie Higson is joined by Aaron Edwards, the author of 'Agents of Influence: Britain’s Secret Intelligence War Against the IRA'.

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With IRA hardliners losing ground and Sinn Féin on the up, Willie Carlin’s feeling confident about his spying. But loose talk is about to put him on a kill list.

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When Willie Carlin makes an alarming discovery in an IRA safe house, he must choose between preserving his cover or conscience.

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