By Alexandra Jacobs A posthumous Joan Didion book, Emily Henry’s latest romance novel, Tina Knowles’s memoir and more. In Espionage and War, Secure Communication Is Key. Just Ask These Spies.

By The New York Times Books Staff In his new book, David Szalay offers unvarnished scenes from a lonely, rags-to-riches life. By Dwight Garner Two new books use divergent styles to look at mind ...