When a young woman leaves her ill mother in a Paris hotel room and comes back later, she finds her mother is missing, and all the hotel's employees deny she and her mother were ever there.
Diana Winthrop and her mother arrive in Paris. When Mrs. Winthrop starts to fee ill, Diana calls for a doctor. Things become more worrisome when she returns to the hotel, and the desk clerk doesn't recall her, and her signature's disappeared from the register, and her mother's disappeared.—Snow Leopard