Often portrayed as an inept and stubborn tyrant, South Vietnamese president Ngo Dinh Diem has long been the subject of much derision but little understanding. Philip Catton's penetrating study provides a much more complex portrait of Diem as both a devout patriot and a failed architect of modernization. In doing so, it sheds new light on a controversial regime.

Catton treats the Diem government on its own terms rather than as an appendage of American policy. Focusing on the decade from Dien Bien Phu to Diem's assassination in 1963, he examines the Vietnamese leader's nation-building and...