Cryptonomicon

Yet another Stephenson beast - 900+ pages! Too long. But very interesting, with two storylines (WWII and 90s). As usual with his books, you can learn a ton about a variety of topics while enjoying the story and (male) characters, if you don't mind the digressions and meandering. This one was heavy on maths, cryptography, digital currency (it's a book from 1999!), history, warfare, tactical deception, codebreaking, mining and a few other areas. Took me almost 5 months to finish though.