An unkown foreigner dies on the operating table of a London hospital, and everything points to an error by the anaesthetist, a former drug addict. One man believes him innocent—his friend, psychiatrist Gregor Maclean. He is proved right when the man’s wife is pulled out of the Thames, drowned. And the killer of both the man and wife is now hunting their daughter to kill her and erase the evidence of a series of crimes committed more than twenty years before. Bit by bit, Maclean untangles the plot involving a high-class ring of drug smugglers prepared to murder again and again to protect their racket, their identity and their powerful ally in Scotland Yard.