Paula Smith, ostensibly an undergraduate at Oxford, had in fact been an undercover policewoman from Special Branch. She had been shot dead from close range, apparently by a member of the party called Don Hayes - the US Ambassador's son. Quite apart from the obvious diplomatic ramifications, Home Office Minister Stuart Wilson wasn't satisfied with the explanations he had been given. Someone needed to dig deeper. One man seemed to fit the a maverick ex-Scotland Yard detective superintendent called George Bulman...