Today's Big Deal at Kindle UK is fifteen crime, thriller and mystery books for £0.99 each. The best of the lot (to me) is Deborah Crombie's newest (2023) Duncan Kincaid/Gemma James book,
A Killing of Innocents. Many of the others are from smaller presses - which may, of course, still have good books

. But YMMV, so here's the link to the sale webpage to look for yourself:
https://www.amazon.co.uk/s?rh=n%3A4725112031&fs=true
Note that the Crombie book is published in Feb 2023, and is not on sale, at least as of now, at Kobo UK...