All four titles in Barbara Nadel’s shorter (and probably lesser known) Francis Hancock series have dropped to £0.99 each at Kindle UK. The titles include:
And the second one, After the Mourning, has been semi-long-term at $1.99 in the US.
Buy Last Rights, #1, at Kindle UK
Buy After the Mourning, #2, at Kindle US | Kindle UK
Buy Ashes to Ashes, #3, at Kindle UK
Buy Sure and Certain Death, #4, at Kindle UK
All four books are now $0.99 each at Kindle US. Here is a link for the series webpage: https://www.amazon.com/dp/B077L6JB5R?binding=kindle_edition
A couple of years later, all four are now $0.99 again in the US – both at Kindle US and at Kobo US.
The link for the Kindle US webpage is in the comment immediately above.
And here are individual links for Kobo US, since there doesn’t seem to be a series webpage:
Last Rights, #1: https://www.kobo.com/us/en/ebook/last-rights-francis-hancock-mystery-1-1
After the Mourning, #2: https://www.kobo.com/us/en/ebook/after-the-mourning-francis-hancock-mystery-2-1
Ashes to Ashes, #3: https://www.kobo.com/us/en/ebook/ashes-to-ashes-francis-hancock-mystery-3-1
Sure and Certain Death, #4: https://www.kobo.com/us/en/ebook/sure-and-certain-death-1