The man codenamed “Caribou” plays a critical role in James Harper’s story, but his own story remains in the shadows. In this bonus episode, Spy Valley host Zach Dorfman sits down with Hanna Kozlowska, journalist and translator of the Polish archives used in the series, to discuss Caribou’s position as a mole for the US within the Polish spy service—and what happened when the Poles found out about his double-cross.

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