By the time he was 26, Jan Karski had been imprisoned by the Soviets, tortured by the Gestapo and nearly drowned while escaping from a hospital in German-occupied Slovakia. Had he chosen then to end his service in the World War II-era Polish underground, few would have challenged his decision. Instead, he to chose to risk his life again, to bring news about Hitler’s mass murder of European Jewry to the outside world.