There is no doubt in Thomasina Elliott's mind that her oldest schoolfriend is a creature of habit. So when, after three years of regular correspondence, Anna's letters suddenly stop, she becomes concerned. And even more so when it transpires that her friend has disappeared without trace, in extremely odd circumstances.
Criminal investigating officer Hanne Wilhelmsen considers the possibility of a serial killer as she tracks down a series of numbers written in blood appearing on walls all over Oslo.
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