Poirot travels to Cornwall, summoned by a Mrs Pengelley, who suspects her dentist husband is poisoning her because he's fallen in love with his young assistant. Unhappily, Poirot finds Mrs Pengelley dead on his arrival, so he sets out to catch her killer.
Quest roles:
John Bowler(Jacob Radnor), Jerome Willis(Edward Pengelley), Amanda Walker(Mrs. Pengelley), Tilly Vosburgh(Jessie Dawlish), Derek Benfield(Dr. Adams), Laura Girling(Edwina Marks), John Rowe(Prosecutor)