The Jewel Robbery at the Grand Metropolitan

In Agatha Christie's "The Jewel Robbery at the Grand Metropolitan," Poirot and Hastings are called on to solve the case of Mrs. Opalsen's missing set of pearls, apparently stolen during a stay at the Grand Metropolitan Hotel. The two suspects are Mrs. Opalsen's maid and the hotel chambermaid, but both blame the other. Who is the real thief? This short story originally appeared in the March 14, 1923 issue of The Sketch magazine.