"Three years after his death at ninety-one, J.D. Salinger remains our most mythic writer. The Catcher in the Rye (1951) became an American classic, and he was for a long time the writer for The New Yorker. Franny and Zooey and Raise High the Roof Beam, Carpenters introduced, by way of the Glass family, a new type in contemporary literature: the introspective, voluble cast of characters whose stage is the Upper East Side of New York. But fame proved...