Pigeonholed in popular memory as a Jazz Age epicurean, a playboy, and an emblem of the Lost Generation, F. Scott Fitzgerald was at heart a moralist struck by the nation's shifting mood and manners after World War I. In Paradise Lost, David Brown contends that Fitzgerald's deepest allegiances were to a fading antebellum world he associated with his father's Chesapeake Bay roots. Yet as a midwesterner, an Irish Catholic, and a perpetually in-debt author,...