Chris Clark was a policeman for twenty-eight years. His chief responsibility, however, was in intelligence gathering and dissemination, helping to steer police towards an understanding of the travelling criminal who crosses boundaries at will. Now retired, he uses his unique expertise to reinvestigate cold cases.
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In March 2011, a major police investigation was opened in the search for missing Swindon local, Sian O'Callaghan. When taxi driver Christopher Halliwell was arrested, Detective Superintendent Stephen Fulcher didn't expect what happened next. After ... SEE MORE