One, Two, Buckle My Shoe

When Hercule Poirot’s own dentist, Henry Morley, is found dead from a gunshot wound, the official verdict is that he has killed himself; a verdict apparently supported when it appears that he has given one of his patients a fatal overdose of anaesthetic. Poirot suspects, however, that there is more to the case than at first appears, and soon events confirm his worst suspicions.