The Turning Tide is a hymn to a sea passage of world-historical importance. Combining social and cultural history, nature-writing, travelogue and politics, Jon Gower charts a sea which has carried both Vikings and saints, invasion forces and furtive gun-runners, writers, musicians and fishermen.

The divided but interconnected waters of the Irish Sea - from the narrow North Channel through St George's Channel to where the Celtic sea opens out into wide Atlantic - have a turbulent history to match the violence of its storms. Jon Gower is a sympathetic and interested pilot, taking the reader to the great shipyards of Belfast and through the mass exodus of the starving during the Irish Famine in coffin boats bound for America. He follows the migrations of working men and women looking for work in England and tells the tales of more casual travellers: sometimes seasick, often homesick too.