It was the last refuge of the desperate Jews-the warren of sewers underneath their city. Above, the Nazis implemented the destruction of their friends and relatives in a final Aktion against the ghetto in the Polish city of Lvov. A small band of Jews, however, escaped into the grim network of tunnels, there to live for fourteen months with the city's waste, the sudden floods that washed some of them away, the fumes and the damp, the rats, the darkness, and the despair. Their only support was a sewer worker, an ex-criminal who constantly threatened to leave them if they ran out of...