It may be easy to forget because we all know how the story ends, but in the spring of 1940, as Churchill became prime minister, a German invasion seemed imminent, and the fate of Britain precariously hung in the balance. Erik Larson details the first year of Churchill's leadership during the war, the escalating aerial attacks, and the behind-the-scenes politicking with an isolationist America in his new book, "The Splendid and the Vile: A Saga of Churchill, Family, and Defiance During the Blitz."