Colwyn Yeats, expert sailor and veteran of the war in Afghanistan, is all set to spend his summer aboard his university's research vessel, working towards his PhD, but the trip is cancelled at the last moment, leaving him at a loose end. Fortune arrives when an old college pal appears, and Yeats agrees to act as skipper and navigator on a transatlantic sailing voyage the man and his two friends have planned for the summer. Misfortune arrives when he's found unconscious, alone and with no identification, on a rocky shore amidst the wreckage of the boat, and wakes up in a rescue helicopter,...