The murders had been savage and apparently motiveless. Carbon copies of killings committed years earlier and by men currently incarcerated in one of Britain's top maximum security prisons. How could this be?     Detective Inspector Frank Gregson must find the answers. Answers which will bring him into conflict with one of those prisoners, a man framed for a murder he didn't commit and determined to discover who framed him and why.     These two obsessive men, on their private quests, will clash as they seek the truth which links Whitely Prison with London's seedy underworld of sex-shows and drug barons.     One wants vengeance, the other wants the truth. What they discover threatens not only their lives but their sanity…