by Len Deighton
Knopf; 344 pages; $9.95
It is one of the marvels of this century that the Germans did not conquer Britain in World War II. To this day, Englishmen wonder how they would have fared and behaved as an island extension of the Third Reich. The premise of Len Deighton's absorbing new novel is that there would always have been an England, even under Nazi rule.
The year is 1941. Winston Churchill has been executed. The King, rescued from the ruins of Buckingham Palace, is imprisoned in the Tower of London. The...