Nina Borg, a Red Cross nurse, wife, and mother of two, is a compulsive do-gooder who can't say no when someone asks for help—even when she knows better. When her estranged friend Karin leaves her a key to a public locker in the Copenhagen train station, Nina gets suckered into her most dangerous project yet. Inside the locker is a suitcase, and inside the suitcase is a three-year-old boy: naked and drugged, but alive.
 
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"One morning before school, two children find the naked bodies of five men hanging from the gym ceiling. The case leads detective Konrad Simonsen and his murder squad to the school janitor, who may know more about the killings than he is telling. Soon, Simonsen realizes that each of the five murdered men had a dark and terrible secret in common. And when Simonsen's own daughter is targeted, he must race to find the culprit before his whole world is...