Anglia Television.

Walking along paths that had ceased to exist a hundred years ago at the Palace of Versailles, Miss Morison, a principal at an Oxford college, and her successor Miss Lamont, are led by a ghost through a mystical experience that will trouble and torment them the rest of their lives.

Scotland Yard's Adam Dalgliesh is searching for a "back seat strangler" who has already murdered four people. When an unpopular forensic scientist is found dead in a British government laboratory, Dalgliesh discovers that almost everyone there could be a suspect. When another body is found nearby, the detective must race against time to find the killer.