When one of the ladies in residence at Hampton Court Palace fails to answer her maid's call in the morning, Mrs Lydia Bramble, palace housekeeper, is called in to investigate. What Mrs Bramble finds sends shockwaves through the whole palace: Miss Philomena Franklin, slumped over her desk, a knife in her back. With the police determined to bark up the wrong tree, Mrs Bramble decides to take up her own investigation with the help of Miss Franklin's maid. After all, as servants, they know just how many dangerous secrets and secret squabbles the genteel residents of the palace apartments harbour.