The Map Thief by Michael Blanding
I found The Map Thief absolutely fascinating, not so much because of map dealer turned thief E. Forbes Smiley, but because of all the information about the history of mapmaking and map collecting.
I will admit that I did pick it up because it's a true crime story. Smiley was a respected antiquarian map dealer in who ended up over his head and began stealing rare and famous maps from universities and turning around and selling them. Eventually, he got caught, but it was surprising how little security the rare book/map rooms had. And how incomplete the record-keeping was. And collectors and most other dealers never questioned his finds either.
My favorite parts of the book were when Blanding spent time explaining the maps that were stolen and their significance. It was well-researched and easy to read. I learned so much about maps, their uses, the history of map making, and the historical figures behind them. I probably won't remember much...