‘The sea defines us, connects us, separates us,’ Philip Hoare has written. His prize-winning Leviathan, then a collection of essays called The Sea Inside and now RISINGTIDEFALLINGSTAR together make a loose, meditative trilogy on people, the ocean, its inhabitants, its threats and delights, the comings and goings, the whole tidal business, its excitements and its ever-present grip on our minds and imaginations.