This man didn't show up till nearly the end of the book, but he was the reason that Wladyslaw survived. He was a German officer with a kind heart. During the war, Hosenfeld kept a journal that highlighted his thoughts on the war. He did not appreciate what was going on. He thought of himself as a coward for not standing up to fight against the crimes that were committed by his own people.
In his own way, he did standup and help the Jews. When he found Wladyslaw in hiding, he went out of his way to bring the man food and to help him stay warm. After the war, Wladyslaw learned about other Jews Hosenfeld had helped during his time as a German officer. Wladyslaw did everything he could to find Hosenfeld after the war, but he didn't know his name. It wasn't until many years later that Wladyslaw learned who his savior truly was and how the man had helped others. Hosenfeld died before Wladyslaw could ever meet up with him again.