S04E03 - One, Two, Buckle My Shoe

Leaving the dentist’s practice after an appointment, Poirot happens to notice the arrival of Mabelle Sainsbury Seale and returns to her the shiny buckle that has fallen from her shoe. Later, he hears from Japp that Morley has died of a gun shot. Between Poirot’s appointment and Morley’s death there were only three patients: Banker Alistair Blunt, Mabelle, and a Greek blackmailer named Amberiotis. The presence of a man thought essential to the country’s economic survival (Blunt) ensures Japp’s involvement in the case; when Amberiotis turns up dead from an overdose of anaesthetic, it is thought that the dentist has killed himself after realising the accident for which he had been responsible.