Even the great Poirot harbours a deep and abiding fear of the dentist, so it is with trepidation that he arrives at the celebrated Dr Morley’s surgery for an examination.Yet even Poirot couldn’t have guessed that only hours later he would be examining the dentist, dead in his surgery – an apparent suicide.Why would a successful dentist choose to kill himself on such a busy day? Poirot turns to the other patients for answers – but only finds other, darker questions.