There is nothing like like a novel set in the recent past to remind you of how quickly things change. In 2005, if a novelist had published a book that hinged on the murder of a Jewish American journalist by Islamic terrorists in Iraq, it would have been read as a political novel, a war novel, a post-9/11 novel—and, of course, a roman a clef about Daniel Pearl, who was murdered in 2002 in Pakistan. Seven years later, Joshua Henkin has published just such a book in The World Without You, which is set in 2005 on the anniversary of the murder of Leo Frankel, whose story closely mirrors Pearl’s. The story takes place entirely on the Fourth of July weekend—an invitation to reflect on the state of the nation if ever there was one.