Amazon.com (ISBN 0099992000, Paperback)

A gripping World War II mystery novel with a cryptographic twist, Enigma's hero is Tom Jericho, a brilliant British mathematician working as a member of the team struggling to crack the Nazi Enigma code. Jericho's own struggles include nerve-wracking mental labor, the mysterious disappearance of a former girlfriend, the suspicions of his co-workers within the paranoid high-security project, and the certainty that someone close to him, perhaps the missing girl, is a Nazi spy. The plot is pure fiction but the historical background, Alan Turing's famous wartime computing project that cracked the German U-boat communications code, is real and accurately portrayed. Enigma is convincingly plotted, forcefully written, and filled with well drawn characters; in short, it's everything a good technomystery should be.