Wolfe Brothers. 1-3: Underdogs. Before THE BOOK THIEF, Markus Zusak wrote a trilogy of novels about the Wolfe Brothers: THE UNDERDOG, FIGHTING RUBEN WOLFE, and GETTING THE GIRL. Cameron and Ruben Wolfe are champions at getting into fights, coming up with half-baked schemes, and generally disappointing girls, their parents, and their much more motivated older siblings. They're intensely loyal to each other, brothers at their best and at their very worst.