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.

Spy Valley is a Project Brazen production. Subscribe to Brazen+ on Apple Podcasts or at brazen.fm/plus and get exclusive bonus episodes for Spy Valley and all our shows, as well as ad-free listening and early access to new podcasts.

For more fearless storytelling, search for the Brazen channel on Apple Podcasts or visit brazen.fm, home to all our podcasts, documentaries and newsletters. At Brazen, we show you how the world really works – from espionage and corruption to deal-making and organised crime, we’ll take you inside stories from hidden worlds.