An omnibus of the first three Berlin Noir books by Philip Kerr is on sale for $1.99/£0.99 in the US/UK respectively. This series features Bernie Gunther as a German PI in Nazi Germany (and later), and several of the books in the series have been nominated for various awards. (And, I've liked them too, and so did some one(s) else upthread.) The three titles in the omnibus are:
March Violets,
The Pale Criminal, and
A German Requiem.
Kindle US:
https://smile.amazon.com/Berlin-Noir...dp/B006LFO1DA/
Kobo US:
https://www.kobo.com/gb/en/ebook/berlin-noir
Kindle UK:
https://www.amazon.co.uk/dp/B076H6BKNZ/