In Part Four of his new book, "Character is Destiny," McCain writes about his role as chaplain for Christmas service in his Vietnamese prison, and about a guard who snuck in at night to loosen the ropes that bound McCain, and then snuck in in the morning to tighten them before other guards could notice.The guard said nothing while performing this kindness, but one time, in the yard, "I became aware of him as he walked near me and then, for a moment, stood very close to me. He did not speak or smile or look at me. He just...