One, Two Buckly My Shoe / Agatha Christie / 286 pages / Deceased Author Challenge

Hercule Poirot's dentist is discovered dead of a gunshot wound shortly after the detective's annual check-up.  The death is believed to be a suicide.  Supposedly, Dr. Morley was despondent over administering an overdose of sedative to a patient which resulted in his death.  In the course of the investigation, Poirot uncovers a dead witness beaten beyond recognition and a gardener who unexpectedly encounters a gun in the garden just after a shot has been fired.  As always, Poirot uses his excellent skills of observation, deductive reasoning, and knowledge of human nature to solve all the murders.