Oslo, New Year's Eve. The annual firework celebration is rocked by an explosion, and the city is put on terrorist alert. Police officer Alexander Blix and blogger Emma Ramm are on the scene, and when a severely injured survivor is pulled from the icy harbour, she is identified as the mother of two-year-old Patricia Smeplass, who was kidnapped on her way home from kindergarten ten years earlier and never found. Blix and Ramm join forces to investigate the unsolved case, as public interest heightens, the terror threat is raised, and it becomes clear that Patricia's disappearance is not all that it seems-