Series following a year in the life of the most southerly islands of the Outer Hebrides, off the north-west coast of Scotland. As the shortest day of the year approaches in his remote island parish, the new priest Father John Paul launches a bold plan to bring light into the heart of his community through the long hours of darkness. Meanwhile, it is the season for parishioners to clear their consciences and make confession; and Father Roddy's American housekeeper Sandy decides she wants to change nationality and become Scottish.