"During a pivotal few months in the middle of the First World War all sides--Germany, Britain, and America--believed the war could be concluded. Peace at the end of 1916 would have saved millions of lives and changed the course of history utterly. Two years into the most terrible conflict the world had ever known, the warring powers faced a crisis. There were no good military options. Money, men, and supplies were running short on all sides. The German...