I'm trying to narrow things down a little more.
Hamilton by Ron Chernow. Technically not reading, doing the audio book. Almost done, but am really enjoying it.
Grant, also by Chernow. U.S. Grant is not someone I knew much about, despite being a bit of a Civil War buff (although not a very good one, apparently). It's a great book so far.
Tigerman by Nick Harkaway. I loved his previous two books, with The Gone-Away World probably in my top 10 of all time. This one is not as good...it just doesn't quite have the same humor as the previous two.