The Spy Who Saved D-Day Guest: Nigel West, Intelligence Historian Garbo, the most notorious and successful double agent of WWII, was thought to be dead and gone. Here’s his real story. Best Spy Books Guest: Rachel Wadham, Education and Juvenile Literature Librarian and regular contributor to The Lisa Show on BYUradio Rachel Wadham is back to discuss some of the best books about spies and espionage.