And Then There Were 39: One, Two, Buckle My Shoe by Agatha Christie

While a trip to the dentist with Agatha Christie is the only trip
to the dentist one might actually enjoy, we are sad to report our
enjoyment of this novel was somewhat sullied by the incompleteness
of the puzzle mystery therein. Thank goodness for Inspector Japp,
who makes his final appearance in a Poirot novel in these pages,
and who does not disappoint on screen either, as brought to life by
the talented Philip Jackson.