Nina Borg, a Red Cross nurse, wife and mother of two, is trying to live a quiet life. The last thing her husband wants is for her to go running off on another dangerous mission to help illegal refugees. But when Nina's estranged friend Karin leaves Nina a key to a public locker in a Copenhagen train station and begs her to take care of its contents, Nina gets drawn into a brutally violent underworld. Inside the suitcase is a three-year-old boy: naked, drugged, but alive. Nina tries to find out who the boy is, but when Karin is murdered, their lives are threatened too.