"As World War II rages in North africa, General Irwin Rommel marches his troops swiftly through Egypt, aiming to overrun the entire Middle East. An uncanny sense of his enemies' weaknesses and positions informs each move. The Nazis, somehow, have a source for the Allies' greatest secrets. Yet Rommel is not the only one with stolen knowledge. Allied cryptographers are breaking the extraordinarily complex Nazi code Enigma. On the brink of disaster, a fevered, high-stakes search for the Nazis' source begins."--Dust jacket flap.