Kindle US has a limited-time deal on mysteries and thrillers for $0.99 and up. Per the blurb on the webpage, the deal expires 02/07/21 11:59pm PDT. It's mostly the usual Amazon-published titles/authors, some of which are pretty good, but they go on sale so often it's not worth listing them. But in addition, I did spot:
- The Forgotten Man, Elvis Cole and Joe Pike #10, by Robert Crais, $2.99
- Righteous, IQ #2, by Joe Ide, $3.99
- In a House of Lies, Rebus #22, by Ian Rankin, $3.99
- A Lesson in Dying, Inspector Ramsay #1, by Ann Cleeves, $1.99
- Penny for Your Secrets, Verity Kent #3, by Anna Lee Huber, $2.99
- 21 Immortals: Inspector Mislan and the Yee Sang Murders, Inspector Mislan #1, by Rozlan Mohd Noor, $1.99 - I got a chance to read an ARC of this and really liked it - set in Malaysia - the murder method is pretty cool
- Midwinter Murder: Fireside Tales from the Queen of Mystery, looks to be a new collection of old short stories by Agatha Christie, $2.99
- The Stranger Diaries, Harbinder Kaur #1, by Elly Griffiths, $2.99
In addition,
Dead Lions by Mick Herron, as posted by @GARussell just above, is part of the sale, so now you know how long you have to buy it

.
Of course, these are to my taste - YMMV!
link to the sale page:
https://www.amazon.com/s/ref=s9_acsd..._i=11552285011