The MessengerJan Karski, a young Polish diplomat turned cavalry officer, joined the Polish underground movement after escaping from a Soviet detention camp in 1939. He served as a courier for the underground, ferrying messages between occupied Poland and the exiled Polish leaders, before he was captured and brutally tortured by the Gestapo. Escaping from the Germans, Jan Karski was charged with the mission of his lifetime: to convey a message to the Allies about