At the beginning of the Nazi period, 25,000 Jewish people lived in Tarnow, Poland. By the end of the Second World War, nine remained. Like Anne Frank, Israel Unger and his family hid for two years in an attic crawl space. Against all odds, they emerged alive. Now, after decades of silence, here is Israel's "unwritten diary." Nine people lived behind that false wall above the Dagnan factory in Tarnow. Their stove was the chimney that went up through...