Captain Lacey Regency Mysteries Volume One contains the first three books and a couple of short stories in the Captain Lacey series by Ashley Gardner (pen name for Jennifer Ashley). It’s on sale for $0.99/£0.99 at Kindle US/UK right now. The omnibus includes: The Hanover Square Affair, A Regimental Murder, The Glass House, and The Gentleman’s Walking Stick (the short stories).
And, if $0.99/£0.99 is too much for you to try the series, the first book, The Hanover Square Affair, is free right now as well!
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. In any case, it has dropped to $0.99 at Kindle US and Kobo US, and £0.99 at Kindle UK. And it’s discountable at Kobo US, where coupon code “Partners22” is still good for 40% off, at least as of yesterday
Kindle US: https://www.amazon.com/dp/B011HGW4NQ
Kobo US: https://www.kobo.com/us/en/ebook/captain-lacey-regency-mysteries-volume-3
Kindle UK: https://www.amazon.co.uk/dp/B011HGW4NQ
Murder in the Eternal City is the sixteenth and most recent (2022) in the Captain Lacey series. It’s £0.99 at Kindle UK right now: https://www.amazon.co.uk/dp/B0B55G2WDK
An omnibus of the three most recent Captain Lacey mysteries is $0.99/£0.99 at Kindle US/UK right now. I’ve read two of the three so far and liked them. Books in the omnibus include: Murder in St. Giles, Death at Brighton Pavilion, and The Custom House Murders.
Captain Lacey Regency Mysteries Volume 5
Kindle US: https://www.amazon.com/dp/B09HRG57PR
Kindle UK: https://www.amazon.co.uk/dp/B09HRG57PR
A Mystery at Carlton House is the twelfth in the Captain Lacey mystery series. It’s free right now at Kindle US and UK.
Kindle US: https://www.amazon.com/dp/B01N5L2QGW
Kindle UK: https://www.amazon.co.uk/dp/B01N5L2QGW
If you missed the Captain Lacey Regency Mysteries Volume 5 omnibus when it was on sale a few months ago, now one of the individual books from that omnibus is on sale for $0.99/£0.99 in the US/UK right now, and discountable at Kobo…
Murder in St. Giles, Captain Lacey #13
Kindle US: https://www.amazon.com/dp/B078XK71RV
Kobo US: https://www.kobo.com/us/en/ebook/murder-in-st-giles
Kindle UK: https://www.amazon.co.uk/dp/B078XK71RV
And the first book in the series, The Hanover Square Affair, is still free, if you want to try the series out. The links in the OP for that are still good.