Fiction by Michael Crichton
This novel, written in 1975, is based on actual events in the 1850's. It was really fascinating to read, and particularly the audible.com edition I listened to (with the much nicer cover, see right) was enjoyable because of the accents.
The story is about, obviously, a train robbery, and makes much use of nineteenth-century British criminal slang that should be incomprehensible to modern ears, but somehow isn't.
This is really a good book.
I also read recently by this author: Eaters of the Dead