What could have driven the successful, respectable dentist Morley to suicide? He had no problems with his mind, no shortage of money, and no love tragedy. The famous detective Hercule Poirot, who for a long time had been his client, doesn’t believe the suicide version. While investigating the case, the Belgian meets and talks with Morley’s old patients, his partners, and friends. As a result, Poirot forms a firm conviction that the dentist had long been planned for murder— and not just him…