Since the dawn of time, the Isle of Mull, off the Scottish coast, has had to fend off ferocious winds and a ravenous ocean intent on swallowing the island whole. Roughened by ceaseless storms and chill, Mull remained a quiet community, set in its ways, with almost no fodder for town gossip, as the nineteenth century drew to a close. Until, that is, new blood moved in, setting the local Campbell sisters, Innis and Biddy, against each other in all-out...