Judge Birgitta Roslin has particular reason to be shocked: Her grandparents, the Andrens, are among the victims, and Birgitta soon learns that an Andren family in Nevada has also been murdered. She then discovers the nineteenth-century diary of an Andren ancestor--a gang master on the American transcontinental railway--that describes brutal treatment of Chinese slave workers. The police insist that only a lunatic could have committed the Hesjovallen murders, but Birgitta is determined to uncover what she now suspects is a more complicated truth.