Humphrey and Ailsa met as children, by the grey Northern sea to which they are returning. Humphrey was already a serious child, drawn towards the underwater world of marine biology, but there were as yet few signs of Ailsas dazzling transformation into a flamboyant feminist celebrity. The novel traces the evolution of their careers and their passionately entangled relationship, and brings them together again to see what they will make of their past, and in what spirit they will be able to face the future.