In the wake of a tempest hitting her town, Morwenna is left to take care of a stranger washed ashore. The storm is just another of many that have plagued the town for years - people blame the tide singers, legendary sea people who are said to charm storms with their singing. Morwenna has never believed the tales, but when she is left alone with the stranger, she realises this is no ordinary girl. Can the stories be true? Can the girl control the tides with nothing more than her voice? Her arrival brings danger of a different kind, and Morwenna must draw on all the courage she has in order to stop a conflict that could destroy her home.