Fiction: The Chronicles of Narnia: Voyage of the Dawn Treader by C.S. Lewis -- with and for my son. He's 8 so he can read it easily, but I'm there to tell him what a "teetotaler" is (for -- not by -- example). It's also a refresher for the next film after Prince Caspian and since my boyhood.
Non-fiction: War Made New: Technology, Warfare and the Course of History by Max Boot. Boot's The Savage Wars of Peace was amazing. I hope to teach a military history course next Spring semester. It's outside my official education, but it's in my wheel-house of avocational reading (I'd call myself an autodidact -- mostly) and the benefits of teaching at a small liberal arts university is the opportunity to be a "utility player" -- "jack of all trades" for any non-baseball playing readers.