This new book by Mahmood Mamdani, one of the world's most respected Africa scholars, stands a good chance of replacing Gérard Prunier's "The Rwanda Crisis" as the standard English-language introduction to Rwanda and its genocide. Mamdani's highly-readable account focuses on the political construction of Hutu and Tutsi as racial/ethnic identities, tracing the tale from the pre-colonial era, through Belgium's administration of the country, to the 1959 Revolution and subsequent attempts to develop an overarching sense of Rwandan nationhood. These attempts were cut short by the rise of Hutu Power in the early 1990s, culminating in the horrific outbreak of mass killing in April 1994. The advantage of Mamdani's book is that it offers "history from below," arguing that the racialized hostility between Hutu and Tutsi helps to account for the extraordinary (perhaps unprecedented) degree of popular involvement in the 1994 killing campaign. He also stresses the regional context of the Rwandan civil war and genocide, with separate chapters on Uganda and Congo/Zaire. The book is rich in theoretical insights but never ponderous or pretentious. A "must" for any student of Rwanda or modern African politics more generally (see also Mamdani's award-winning 1996 book "Citizen and Subject," which fleshes out some of the theoretical frameworks used in "When Victims Become Killers").