Berlin Game is the first in the Bernard Samson series by Len Deighton. A Penguin Modern Classics (!) version of
Berlin Game is on sale for £0.99 at Kindle UK today, as part of today's Daily Deal. Per SYKM, this was a finalist for the 1983 Gold Dagger Award.
Kindle UK:
https://www.amazon.co.uk/dp/B08QV7L1MY/
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B08QV7L1MY/