Karol (Lolek) Wojtyla and Jerzy (Jurek) Kluger were schoolmates until the autumn of 1938. They played hockey and went to dances together, went skiing and swimming, and studied in one another's houses. They learned about life from their loving families and endured the agony of tests and entrance examinations as a team. High school graduation and creeping anti-Semitism led to their separation. In the years that followed, they endured the unendurable:...