Two separate bargains in the US & UK for police procedural crime thrillers by award-winning Norwegian author Jo Nesbø (
SYKM,
Wikipedia) in his popular Harry Hole series starring a recovering alcoholic Inspector in Oslo:
@ $1.99 USD from HarperCollins,
The Devil's Star, #5 in the series. This forms the 3rd part of the overarching “Oslo Trilogy” mini storyarc within the books which sees Harry return to local policing after his initial overseas investigations, but has a pretty good self-contained crime case within it with a clever and tricky whodunnit, and is one of the better titles, IMHO. Apparently, it was selected to be the 1st novel available in English translation back when they started getting ported.
@ £0.99 from Random House's Vintage imprint,
The Snowman, #7 in the series with two minor Norwegian Best Novel awards, which is a reasonably self-contained crime case which is also a decent jumping-on point as far as personal/cast developments go, since IIRC this kicked off another mini storyarc running through the next few books. This has recently been adapted into a film starring Michael Fassbender from the X-Men movies. NB: this one is one of the gorier cases in a series that overall doesn't shy away from depictions of violence, in case you might be sensitive about that sort of thing.