The House of the Red Slayer is the second in Paul Doherty’s Brother Athelstan series. It is a recent price drop to £0.99 at Kindle UK. And the first title in the series, The Nightingale Gallery, is free right now at Kindle US. So you can try the series inexpensively if you wish.
Doherty is one of the most prolific writers I’m aware of, writing under his own name and variants (PC Doherty), and also under several pen names, including Anna Apostolou, Michael Clynes, CL Grace, and Ann Dukthas. Whew! And, it turns out that a lot of Doherty’s books are pretty inexpensive in both the US and UK: more than a webpage each at $0.99/£0.99 and multiple webpages at $1.99/£1.99. Just go to his author page and sort by price. I’ve read and really liked his Amerotke series, set in ancient Egypt, and also his Alexander the Great series. I’ve also read a fair number of other books of his across many of his other series, although I’ve felt a little more hit-and-miss about some of them.
Anyway, here are links for the specific two I’ve talked about:
Get The Nightingale Gallery free at Kindle US
Get The House of the Red Slayer for £0.99 at Kindle UK
And price-sorted author pages for Doherty:
At Kindle US
At Kindle UK
The Nightingale Gallery is now also free at Kindle UK: https://www.amazon.co.uk/dp/B0844KN1KG/
Nightshade is the sixteenth in Doherty’s Hugh Corbett series. It has dropped to £1.99 at Kindle UK: https://www.amazon.co.uk/dp/B009S8AUC8
Murder Most Holy is the third in the Brother Athelstan series by Paul Doherty. (Per SYKM, these were originally written using the pen name, Paul Harding.) It has dropped to $0.99 at Kindle and Kobo US, and it’s discountable at Kobo…
Kindle US: https://www.amazon.com/dp/B0844W3TXN
Kobo US: https://www.kobo.com/us/en/ebook/murder-most-holy-2
The Nightingale Gallery is free again at Kindle UK. Not free at Kindle US, at least as of now… The link in the first comment is still good…
The House of Crows is the sixth in Doherty’s Brother Athelstan series. It’s £0.99 right now at Kindle UK: https://www.amazon.co.uk/dp/B0844WLBVM
The Great Revolt is the sixteenth Brother Athelstan book. It’s £0.99 at Kindle UK right now: https://www.amazon.co.uk/dp/B09VB8CTD6