The Chocolate Box

Poirot investigates a murder in which the only clue is a box of chocolates. This case took place in Brussels early in his career when he was a detective with the police force there. Likely before the start of the Great War.

As far as we are aware, this is the earliest Poirot case!

Librarian's note: this entry is for the story, "The Chocolate Box." Collections of short stories by the author can be found elsewhere on Goodreads. Individual entries, including the characters and settings, for all 51 Poirot short stories, plus a 52nd, "Hercule Poirot and the Greenshore Folly" which was discovered in 2014, can be found by searching Goodreads for: "a Hercule Poirot Short Story."