Hitler's Horses: The Incredible True Story of the Detective who Infiltrated the Underworld
ISBN: 1529106109
Buy on Amazon
Found in 1 comment on Hacker News
muzani · 2023-09-15 · Original thread
He did literally write a book on infiltrating the Nazi underground to get artwork back.

https://www.amazon.com/Hitlers-Horses/dp/1529106109

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