The man was London-born Rabbi Eli Shlanger. Minutes later, he was standing beside Goldstein's bed, reciting prayers over her near-lifeless body. He asked if he could blow the shofar; in a ward filled with unconscious patients, there was little danger of disturbing anyone. As he prayed, something in Goldstein shifted, and 24 hours later, her lungs began to improve. A week later, Rabbi Eli returned to the hospital and found her alive. "You survived; that’s a miracle," he told her, and doctors agreed. It was the beginning of an unlikely friendship. Goldstein, a secular journalist, and Rabbi Eli, a Chabad rabbi,...