A woman's body is found in the third-floor flat at Friars Mansion. And who should live in the very same building but Hercule Poirot! Another woman accidently locked herself out of her flat and her friends found an interesting way to get in and retrieve the key. But they made a mistake in their calculation as to which flat was hers. What did they find in the dark? Blood and a body. Our perspicacious detective then offered assistance.

Librarian's note: this entry is for the story, "The Third Floor Flat." Collections of short stories by the author can be found elsewhere on Goodreads. Individual entries for all Poirot short stories can be found by searching Goodreads for: "a Hercule Poirot Short Story."