One Sunday morning before church, when Welles Crowther was a young boy, his father gave him a red handkerchief for his back pocket. Welles kept it with him that day, and just about every day to come; it became a fixture and his signature. Welles became a volunteer with the local fire department in New York. When the Twin Towers fell, Welles's parents had no idea what happened to him. In the unbearable days that followed, they came to accept that he...