I read pretty much anything, from fantasy (City of Stairs by Robert Jackson Bennett) to romance (Bared to You by Sylvia Day) to classics (Heart of Darkness by Joseph Conrad). The only genres I don't read are self-help and comic books/graphic novels.
This was a fascinating true story of espionage during WWII. I have added his earlier book to my "for later" list. I could not put it down, reading late into the night, despite having to get up early the next morning, taking every free moment I had to read a few more pages.