book recommendation - masters and servants

[onlydizzier]

Can anyone recommend a book that is similar in feel to Downton Abbey or Gosford Park, in that it has an upstairs/downstairs dynamic? I'd like for the characters on both sides of the green baize door to be fully realized, with their own problems and stories. I've read THE HOUSE AT RIVERTON, so anything beyond that would be appreciated.

Thanks!

ETA: This doesn't necessarily have to be historical fiction, though that was my first thought. Something along the same lines in mystery, fantasy, or any other genre would be fine.