This fourth edition of the Historical Dictionary of the Sudan does so, first, through a lengthy and detailed chronology tracing its relatively few successes and numerous failures. The introductory essay does an admirable job of putting it all in perspective. But the most informative part is the dictionary, with now over 700 entries for this fourth edition. They deal with important personalities, politics, the economy, society, culture, religion and inevitably the civil war. There are also appendixes and an extensive bibliography.