On a remote island in Orkney, a curiously-matched couple arrive on their honeymoon. He is an eminent literature professor; she was his pale, enigmatic star pupil. Alone beneath the shifting skies of this untethered landscape, the professor realises how little he knows about his new bride and yet, as the days go by and his mind turns obsessively upon the creature who has so beguiled him, she seems to slip ever further from his yearning grasp. Where does she come from? Why did she ask him to bring her north? What is it that constantly draws her to the sea?