John Creasey wrote what is, IMO, one of the best long-lived police procedural series, featuring George Gideon of Scotland Yard and his crew. These books were originally written starting in the 1950s, using one of Creasey’s pen names, JJ Marric. Per SYKM, the seventh book, Gideon’s Fire, won the 1962 Edgar Award for Best Mystery (and the last few books were written by another author), but right now, an omnibus of the first three books in the series is on sale at Kindle US and UK for $0.99/£0.99. And if you like the first three, a good chunk of the rest of the series is $2.99 in the US, and £1.99 in the UK, with more on the way.
It appears a new publisher, Silvertail Books, whose website looks pretty legit to me, has gotten rights to this series and is publishing them at Kindle US/UK. At Kobo, meanwhile, the old publisher’s versions (House of Stratus) are still up, with prices mostly at a crazy $8.99 in the US, and a somewhat more reasonable £3.99 in the UK.
(I haven’t read any of these since the 1980s or so, so I do have a bit of concern that some of them might be a bit dated, but I really enjoyed the investigative aspects, which shouldn’t get dated too much. Other than not having modern technology, of course. As opposed to societal norms, though, which might be dated in more objectionable ways. But I don’t remember anything that made me wince at the time. And I do remember a lot that I liked at the time.)
Gideon: The First Three Books contains Gideon’s Day, Gideon’s Week (apa Seven Days to Death), and Gideon’s Night
Buy at Kindle US | Kindle UK
Series webpages (Kindle/Silvertail versions): Kindle US | Kindle UK
Series webpages (Kobo/House of Stratus): Kobo US | Kobo UK
And of course, as always, when there are multiple publishers’ versions floating around, check carefully before you buy…