Will Tolkachev fall at the final hurdle and land in the hands of the KGB? How do the CIA go about protecting their assets in the field? And, does it really take a spy to catch a spy?

As we reach the final instalment of the story of Adolf Tolkachev, the plot reaches its dramatic crescendo. Tolkachev has now been working for the CIA for over half a decade and the pressure is clearly taking its toll on both him and the US agents around him. As the two Cold War powers face off on the outskirts of Moscow, which behemoth will come out on top? Listen as David and Gordon conclude their series on the unbelievable story of the Billion Dollar Spy.

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Pre-order a signed edition of David's latest book, The Seventh Floor, via this link.

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Email: classified@goalhanger.com

Twitter: @triclassified

Assistant Producer: Becki Hills

Producer: Callum Hill

Senior Producer: Dom Johnson

Exec Producer: Tony Pastor

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