One, Two, Buckle My Shoe

Mabelle Sainsbury-Seale meets her old friend Alistair Blunt coming out of Dr Morley's dental surgery. And soon afterwards, Dr Morley (Poirot's dentist) is found dead. Japp thinks it was suicide, but Poirot disagrees. Mabelle Sainsbury-Seale is found dead in a flat occupied by a Mrs Chapman. Poirot visits Exsham Manor, where Alistair Blunt lives - and while there, a shot is fired at him. Poirot works on the theory that the death of Dr Morley is in some way connected with the deaths of Mabelle Sainsbury-Seale and another of Morley's patients.