This delightful story is from season 2, and it has all the qualities that were the show's hallmark throughout all the seasons: David Suchet's iconic performance, great supporting characters with well-developed traits and backgrounds of their own, marvellous production design with equally good costume design.
Here we're treated to the mystery of a missing wealthy banker, and Poirot and Hastings make a wager that the former can solve the case without leaving the house. Of course, Poirot delivers, but the charm of this episode is in the subplots, like uncomfortable relationship between Poirot and a parrot he's been given as a pet, where he says that something like that "has no place in the home of a Belgian detective". Some of the best lines in the whole series are indeed delivered here, like the one where Poirot says to Hastings "I'm not talking to the parrot". Unexpectedly fun to watch, some of the short episodes prove to be as remarkable as the longer formats. My sincere recommendations.