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A woman wanting to get away from it all borrows her friend's cottage. It's a cold autumn night and she arrives to discover her friend hanging from a beam. Everyone believes it's suicide. The dead woman had been depressed since the death of her mother two years earlier. However the friend doesn't believe it and approaches Detective Erlandur.
Erlandur is interested enough to begin an unofficial investigation. At the same time he is haunted by the mysterious disappearance of two young people over thirty years earlier.
There is something very disconnected about HYPOTERHMIA which didn't quite work for me. For a start all Erlandur's investigations are unofficial. He isn't on vacation; so how is he allowed to take all this time to persue private interests? His colleagues make only the briefest of appearances at the beginning of the book and take no further part. In fact they aren't even mentioned.
Erlandur's daughter, Eva Lind then begins to nag Erlandur to meet up with his ex-wife and talk to her. He asks her why but she doesn't really give any answer. When they do meet there are recriminations on both sides. Nothing is really achieved. The thread is then dropped. It doesn't relate to anything else in the book; it just hangs there on its own without any resolution at all.
There is also a thread about Erlandur's childhood trauma of being lost in the snow with his father and brother. His brother was never found. Again it seems to be a thread hanging there and not connected to anything else at all.
The whole family is somewhat dysfuncational and Erlandur in particular has great difficulty communnicating. It can make for frustrating reading.
While the plot of HYPOTHERMIA is interesting enough, the disconnection of the plot threads and Erlandur from everyone around him, make the book less than satisfying.