My suggestion for this month's book (and perhaps it should be the book for November, since I'm introducing it so late in October) is Assassination Vacation by Sarah Vowell. Vowell has done humorous essays for NPR's "This American Life" program, and has written editorials for The New York Times. Sarah is a history buff, more particularly of assassinated presidents and their assassins, and Assassination Vacation is a humorous account of a series of vacations she took, visiting places related to the assassination of presidents, and their attackers.
(Sarah Vowell voiced young Violet in The Incredibles, so whenever I read something she's written, I hear that voice reading it. :) )