The Code Book (Simon Singh)
A week or two ago, I finished reading Simon Singh's second book: The Code Book and it is every bit as good as Fermat's Last Theorem was. Simon Singh is, in my opinion and experience, one of the best popular science writers around (though I still need to get a copy of A Brief History of Time). I'd write more on the book but anything I could say, has already been said.
Buy The Code Book from Amazon.
Thomas Sutton 06 January 2005