I am your maid. I know so much about you. But in the end, you: what do you really know about me? Welcome to the prestigious Regency Grand Hotel, with its red velvet carpets, its gilding and its employees, each more incredible than the next. The young Molly, discreet, solitary and zealous, works there as a chambermaid and knows every corner of it. But one day, she finds the wealthy Mrs. Black in her suite, panicked, next to her husband's lifeless body – a complicated mess to order. Involuntarily involved in this strange murder case, Molly will lead the investigation, helped by some precious colleagues and friends. She will then discover that behind the magnificent facade, the Regency Grand hides many secrets...