Recently retired policeman Tom Kettle is settling into the quiet of his new home, a lean-to annexed to a Victorian castle overlooking the Irish Sea. For months he has barely seen a soul, catching only glimpses of his eccentric landlord and a nervous young mother who has moved in next door. Occasionally, fond memories return of his family: his beloved wife June and their two children, Winnie and Joe. But when two former colleagues turn up at his door with questions about a decades-old case, one which Tom never quite came to terms with, he finds himself pulled into the darkest currents of his past.