Khorramshahr, Iran, May 1982--It was the bloodiest battle of one of the most brutal wars of the twentieth century, and Najah, a twenty-nine-year-old wounded Iraqi conscript, was face to face with a thirteen-year-old Iranian child soldier who was ordered to kill him. Instead, the boy committed an astonishing act of mercy. It was an act that decades later would save his own life. This is a remarkable story. It is gut-wrenching, essential,...