It's a steamy, sultry day during a hot Mediterranean summer and Terrence, a rich London lawyer, is relaxing on his yacht with his beautiful wife Cathy and their young daughter Lucy. But the idyllic holiday is shattered when a sudden storm whips up from nowhere. Terrence battles into the night to save the lives of his family and guide the boat into Dubrovnik harbour. Unable to go ashore until daybreak, Cathy is tending to her daughter's injuries when a large motor-cruiser pulls up alongside them. Its wounded skipper, Kurt, comes aboard their yacht seeking medical help, and there, in the darkest hours of the night, Terrence and Cathy are forced to listen to Kurt's disturbing story...