In the spring of 1939, 47-year-old Paul Grüninger was a middle-level police official in St. Gallen, a picturesque Swiss town near the Austrian border. The son of middle-class parents who ran a local cigar shop and a mediocre student who enjoyed the soccer field more than his studies, Grüninger became an unprepossessing man of quiet conventionality. After dutifully serving time in the Swiss army in World War I, he obtained a teaching diploma, settled into a position at an elementary school, attended church on Sundays and married Alice Federer, a fellow teacher.

To please both his mother and Alice, Grüninger applied for a better-paying position in the police department, a job that involved mainly filling out reports and arranging security details for occasional visiting dignitaries. Or so it seemed.

In April 1939, Grüninger found his way to work blocked by a uniformed officer who told him: “Sir, you no longer have the right to enter these premises.” An investigation had revealed that Grüninger was secretly altering the documents of Jews fleeing Austria for the safety of Switzerland. “Non-Aryan” refugees were not allowed to cross the border after August 19, 1938, but all it took was a few strokes of Grüninger’s pen to predate a passport and perhaps save a life, a small action but one of great personal risk.