In 1954, the German writer Heinrich Böll landed in Ireland for the first time, headed west and kept going till he reached the Atlantic Ocean. He was seeking a refuge from the brash materialism of postwar Germany, and found it on Achill Island, where waves crashed against cliffs, sheep foraged in fields and villagers went about their business of fishing, farming and storytelling. The following year he returned with his family and began to observe and chronicle the customs, idiosyncrasies, sorrows and joys of its inhabitants. So began a literary love affair between Germany and a windswept corner of County...