Captain Lacey Regency Mysteries Volume Three contains
A Death in Norfolk,
A Disappearance in Drury Lane, and
Murder in Grosvenor Square, the 8th, 9th, and 10th titles in Ashley Gardner's Captain Lacey series. Or the 7th, 8th, and 9th, if you don't count a book of short stories. Oh yeah, and Ashley Gardner is a pen name for Jennifer Ashley. In any case, it has dropped to £0.99 at Kindle UK.
Several of the early titles in this series were traditionally published, but somewhere along the line, I think Gardner went out on her own with this series, but
SYKM still lists it, and I've read and liked many of the titles in the series, so here's a link...
https://www.amazon.co.uk/dp/B011HGW4NQ