In the late 80s and early 90s, the Agency was rocked by a series of high-profile turncoats Aldrich Ames, Robert Hanssen, and Edward Lee Howard all leaked secrets to the Russians, with often-deadly consequences for agents on the ground. 20 years later, former CIA officer Bob Baer caught wind of a disturbing possibility - that a fourth, and even more insidious mole might have been active at the heart of America's intelligence community.

In Part 2, Vanessa Kirby joins Bob Baer in the present day, where renewed interest in the Fourth Man case throws up more questions than answers...

From SPYSCAPE, the home of secrets. A Cup And Nuzzle production. Series producers: Gemma Newby, Joe Foley. Produced by Morgan Childs. Music by Nick Ryan.

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