A bunch of interesting (to me, at least) price drops on mysteries at Kindle UK, all at £0.99 unless otherwise indicated. Most/all of these are probably from the new monthly sale for November, but if you really want one, don't count on it, go ahead and buy - I haven't verified any of these as part of the sale. Many have been on sale before, so check carefully before you buy...
In this Grave Hour, Maisie Dobbs #13, by Jacqueline Winspear, £1.19:
https://smile.amazon.co.uk/dp/B01N410U0B
Metropolis is the most recently published (2019) in the Bernie Gunther series by Philip Kerr, but it's a prequel:
https://smile.amazon.co.uk/dp/B07C7F7W5X
The Lost Traveller, #7 in the Maura Donovan seires by Sheila Connolly, £1.54:
https://smile.amazon.co.uk/dp/B07D2J14S8
The Noble Path, a non-series title by Peter May:
https://smile.amazon.co.uk/dp/B07R4NWJBM
Death at Sea, a collection of short stories by Andrea Camilleri:
https://smile.amazon.co.uk/dp/B07BDMW8YB
Night Without End, by Alistair MacLean:
https://smile.amazon.co.uk/dp/B004BSGITO
London Bridges, Alex Cross #10, by James Patterson:
https://smile.amazon.co.uk/dp/B004XCFIF8
Gallows Rock, Freyja and Huldar #4, by Yrsa Sigurdardottir:
https://smile.amazon.co.uk/dp/B07R6MYY88
Maigret and the Ghost, Inspector Maigret #62, by Georges Simenon, £1.99:
https://smile.amazon.co.uk/dp/B07D46JZ92
Maigret's Anger, Inspector Maigret #61 by Georges Simenon, £1.99:
https://smile.amazon.co.uk/dp/B07D4764QQ
A Clubbable Woman, Dalziel & Pascoe #1, by Reginald Hill:
https://smile.amazon.co.uk/dp/B00ZVPBYS6
A Necessary End, Inspector Banks Series #3, by Peter Robinson:
https://smile.amazon.co.uk/dp/B003DWC6JA
Aftermath, Inspector Banks #12, by Peter Robinson:
https://smile.amazon.co.uk/dp/B003DWC6NQ
Dead Right, Inspector Banks #9, by Peter Robinson:
https://smile.amazon.co.uk/dp/B003DWC6KY
Abattoir Blues, Inspector Banks #22, by Peter Robinson:
https://smile.amazon.co.uk/dp/B00IORP8WG
Dry Bones that Dream, Inspector Banks #7, by Peter Robinson:
https://smile.amazon.co.uk/gp/product/B003GK21WG/
Proof, by Dick Francis, one of my favorites of his, for the insights into the wine/spirits world, but also has one of the scariest methods of killing IMO:
https://smile.amazon.co.uk/dp/B002RI9HSO
Remember, to get non-Smile links, just substitute "www" for "smile" in the links...