Detective Harry Hole embarrassed the force, and for his sins he's been reassigned to mundane surveillance tasks. But while monitoring neo-Nazi activities in Oslo, Hole is inadvertently drawn into a mystery with deep roots in Norway's dark past - when members of the nation's government willingly collaborated with Nazi Germany. More than sixty years later, this black mark won't wash away, and disgraced old soldiers who once survived a brutal Russian winter are being murdered, one by one. Now, with only a stained and guilty conscience to guide him, an angry, alcoholic, error-prone policeman must make his way safely past the traps and mirrors of a twisted criminal mind. For a hidden conspiracy is rapidly taking shape around Hole - and Norway's darkest hour may still be to come.