On the first Tuesday in October, Rosa Hartung is returning to her job as minister for social affairs following a year's leave of absence--granted after the dramatic disappearance of her twelve-year-old daughter. Linus Bekker, a mentally ill young man, confessed to her killing, but is unable to remember where he buried the various parts of her dismembered corpse, leaving Rosa with no choice but to try to move on without closure. The same day Rosa returns to parliament, a young single mother is found brutally murdered at her home in the suburbs of Copenhagen--she's been tortured, and one hand has been cut off. Thulin and Hess, the detectives sent to investigate the crime, arrive at the address to find a figure made of chestnuts hanging from a playhouse nearby. When yet another woman is murdered--this time with both hands cut off--and another chestnut figure is found, Thulin and Hess begin to suspect a connection to the Hartung case. To put an end to the killing spree, the pair, with nothing in common aside from equally troubled personal lives, realize they will need to put aside their differences in a race against time--and a brutal psychopath.