Even the great detective Hercule Poirot harboured a deep and abiding fear of the dentist, so it was with some trepidation that he arrived at the celebrated Mr Morley's surgery for a dental examination. But what neither of them knew was that, only hours later, Poirot would be back to examine the dentist - found dead in his own surgery. Turning to the other patients for answers, all Poirot finds are darker questions...