Harry Frazer, 'the smoothest divorce lawyer west of Reading', is single-handedly navigating the Green Dolphin in darkness up the perilous west coast of Scotland. Out of nowhere the great black hulk of a ship looms and bears down on the little boat as Harry frantically tries to steer clear. In the din a man falls overboard - Harry rescues him from the cold, dark, polluted water only to find himself drawn into a tense, nailbiting mystery threatening ecological and personal disaster.