On the first page of his masterful account of the sinking of the Lusitania, Erik Larson notes that while researching the book, he realized that “buried in the muddled details of the [Lusitania] affair … was something simple and satisfying: a very good story.” It’s one of those occasions when an author doth protest too much. How a deluxe ocean liner, among the fastest ships on the sea at the time, came to be torpedoed off the Irish Coast remains a powerful episode of history, no matter how many times it’s retold.