Smilla's young neighbour, an Inuit boy, tragically dies in a fall. Police quickly dismiss the case, but she doesn't believe it was an accident. She begins her own investigation, clashing with a police officer and Denmark's leading energy supplier.

Hidden clues lead Smilla toward a secret buried in Greenland; as alliances shift, suspicions deepen, and unseen threats emerge, Smilla must navigate a web of mystery where nothing is as it seems.