From the streets of a modern Midwest city to the dusty, fetid paths of ancient Jerusalem, a conspiracy unfolds that could change the world - and the past. Retired U.S. Army Major David Speer finds himself in a race against - and through - time to stop it while he leads the most daring and important rescue mission in history. A.D. has been likened by reviewers as a blend of Dan Brown and early Michael Crichton.