This episode was amusing but not remarkable. The overall outline is quite similar to the original story: a man is found hidden in a large chest,stabbed to death, and the man who is suspected of having an affair with his beautiful wife is arrested. It seems the suspect, Major Rich, killed the man, stuffed him into a chest, and then later that evening hosted a party at his home, with the man still dead lying in the chest in the same room all along. In the original story, Poirot is brought in afterwards to investigate, but for the purposes of this episode, Poirot actually attends the party, and at one point very reluctantly agrees to dance with the lady he escorted to the party. Who knew Poirot could dance the Charleston? I would have pegged him as more of a waltz man myself.
At any rate, the rest of the plot line is what you would expect: he questions, he discovers clues, he asks Inspector Japp to arrest someone, strictly for the purpose of drawing the real murderer out of hiding. There are a few good lines here, but the best is reserved for the great man himself: when he is called, by a typical xenophobic Englishman, "a bloody little Frog", Poirot summons all his dignity and cries, "I am not a bloody little Frog! I am a bloody little Belgian!" And, as usual, the bloody little Belgian gets his man.