Winter
by Len Deighton
The narrative starts on the eve of the year 1900 with Harald Winter, a German businessman with two sons, Peter and Paul, two very different brothers, whose lives are inextricably linked with Germany in the years leading up to the Second World War. One a scholar and one a romantic, their lives diverge, leading one into the inner mechanisms of the Nazi Party and one into exile in America, the birthplace of their mother.
From their sheltered childhood through their violent coming of age in the Great War, from the chaos of 1920s Berlin to the spreading power of Hitler they are wrenched apart by conflicting ideals and ambitions. Their story is further complicated by their father's long standing affair with a Hungarian woman, eventually revealed to be Jewish; their love for him is overshadowed by their loathing of his behaviour.
Since the entire story unfolds as a flashback from the time of the Nuremberg War Crimes Trials after the Nazis' defeat, the readers know that both would make a career as lawyers, but in widely divergent directions: one would enter the Nazi Party and think up various "legal" ways to legitimise their crimes, while the other brother would be a staunch anti-Nazi, go into exile and come back to Germany after the war as a member of the American war crimes prosecution. But the reader cannot be sure, until deep in the book's plot, which is which.