The book describes Gourevitch's travels in Rwanda after the Rwandan Genocide, in which he interviews survivors and gathers information.
The title comes from an April 15, 1994, letter written to Pastor Elizaphan Ntakirutimana, president of the Seventh-day Adventist Church's operations in western Rwanda, by several Adventist pastors who had taken refuge with other Tutsis in an Adventist hospital in the locality of Mugonero in Kibuye prefecture.