E. H. Carr's What Is History?, a classic introduction to the field, may now give way to a worthy successor. In his compact, intriguing survey, Richard J. Evans shows us how historians manage to extract meaning from the recalcitrant past. To materials that are frustratingly meager, or overwhelmingly profuse, they bring an array of tools that range from agreed-upon rules of documentation and powerful computer models to the skilled investigator's sudden...