S05E08 - The Jewel Robbery at the Grand Metropolitan

Poirot and Hastings are staying at the Grand Metropolitan hotel in Brighton where they meet Mr and Mrs Opalsen. He is a rich stockbroker who amassed a fortune in the oil boom and his wife collects jewellery using the proceeds. She offers to the Poirot her pearls and goes to fetch them from her room but they have been stolen. Poirot is asked to assist. There have only been two people in the room since the pearls were last seen - Mrs Opalsen's maid, Celestine, and the hotel chambermaid. Celestine has orders to remain in the room all of the time that the chambermaid is there. Both girls are questioned and both blame the other. The hotel room has a side room where Celestine sleeps and a bolted door which leads to the room next door. The two maids were in sight of each other all the time except for two pauses of between twelve and fifteen seconds apiece when Celestine went into her room – not enough time to extract the jewel case from the drawer, open it, take the jewels and return the case.