His cheekbones stuck out like mountaintops from a barren valley. Gnawing hunger had tortured him for months. Day and night, his thoughts vacillated between fantasies of his favorite foods — of chewing even — to how he might take his own life. A prisoner’s existence in Neuengamme concentration camp, in the wet and the cold near the German port city of Hamburg, he later explained, was like walking a tightrope. The only way to keep from falling was to focus on yourself and avert your eyes from the unimaginable misery all around you.