Anton and Theodor van Dreveldt grew up in Emmerich, Prussia, as the sons of a Catholic priest and his housekeeper-a situation their father tried to disguise by presenting himself as their uncle. As young men, both Anton and Theodor found their lives increasingly troubled. Anton drank heavily, and Theodor's career was jeopardized by his participation in a banned political organization. These troubles, combined with growing Prussian authoritarianism,...