Some titles from the Kindle UK Autumn sale, ending Nov 10...£0.99 each unless otherwise indicated...many have been on sale before, so check carefully before you buy...
The Ghost It Was, non-series title by Richard Hull:
https://www.amazon.co.uk/Ghost-Was-R...dp/B07J1Q88YS/
Savage Run, Joe Pickett #2, by C.J. Box, £1.79:
https://www.amazon.co.uk/Savage-Run-...dp/B004S7BBR2/
Death Spins the Wheel, Inspector Littlejohn #26, by George Bellairs:
https://www.amazon.co.uk/Death-Spins...dp/B07FN7HQZL/
On Beulah Height, Dalziel & Pascoe, #15, by Reginald Hill, £1.99:
https://www.amazon.co.uk/Beulah-Heig...dp/B00ZVOP2HQ/
The Merchant's House, Wesley Peterson, #1, by Kate Ellis:
https://www.amazon.co.uk/Merchants-H...dp/B004JHY8J4/
The Last Frontier, by Alistair MacLean, £1.49:
https://www.amazon.co.uk/Last-Fronti...dp/B0046A9MSG/
Grave Mistake, fourth from the end (too lazy to count) of the Insp Alleyn series, by Ngaio Marsh:
https://www.amazon.co.uk/gp/product/B00362AMES