I like history.
I just finished Destiny of the Republic: A Tale of Madness, Medicine, and the Murder of a President, by Candice Millard.
It is about the dark horse nomination, election, and assassination of James Garfield.
The book demonstrates that the doctors who refused to use antiseptic procedures really killed President Garfield, rather than the nutcase who shot him. (And how Alexander Graham Bell nearly saved Garfield's life.)