John Pilkington seems to have gotten the rights back to some of his historical mysteries, and now three of them are on Kindle Countdown for $0/99/£0.99 about three-four more days.
The Ruffler's Child, Thomas the Falconer #1
Kindle US:
https://www.amazon.com/dp/B081VSK3XH
Kindle UK:
https://www.amazon.co.uk/dp/B081VSK3XH
A Ruinous Wind, Thomas the Falconer #2
Kindle US:
https://www.amazon.com/dp/B081VSGXMZ
Kindle UK:
https://www.amazon.co.uk/dp/B081VSGXMZ
Marbeck and the Privateers, Martin Marbeck #3
Kindle US:
https://www.amazon.com/dp/B092RC2WW4
Kindle UK:
https://www.amazon.co.uk/dp/B092RC2WW4