Martin Devereux, one of the world's top helmsmen, runs a boatyard and charter fleet on the south coast with his elderly partner, Henry. While Martin is away in Australia, a series of sinister accidents takes place at the boatyard, and when he returns he is determined to get to the bottom of the mystery that is threatening his livelihood. Following an invitation to sail in the Marbella Cup match series, Martin finds himself caught on an accelerating roller coaster of violence and fear that sweeps him to southern Spain – the Costa del Crime.