Until the end of World War II, East Prussia was the German empire's farthest eastern redoubt, a thriving and beautiful land on the southeastern coast of the Baltic Sea. Now it lives only in history and in myth. Since 1945, the territory has been divided between Poland and Russia, stretching from the border between Russia and Lithuania in the east and south, and through Poland in the west. In Forgotten Land, Max Egremont offers a vivid...