Midnight Sun - Jo Nesbo

Jon is on the run. He has betrayed Oslo's biggest crime lord: the Fisherman. Fleeing to an isolated corner of Norway, to a mountain town so far north that the sun never sets, Jon hopes to find sanctuary among a local religious sect. Hiding out in a shepherd's cabin in the wilderness, all that stands between him and his fate are Lea, a bereaved mother and her young son, Knut. But while Lea provides him with a rifle and Knut brings essential supplies, the midnight sun is slowly driving Jon to insanity. And then he discovers that the Fisherman's men are getting closer...