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.

An ambitious entrepreneur and a right-wing politician form an unlikely partnership; Smilla grows closer to her neighbour, who was responsible for taking Isaiah to his regular hospital visits, and who also wants to uncover the truth.

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.

Framed for a crime, Smilla goes on the run with help but soon faces betrayal and lost secrets; a shadowy leader takes charge, setting the stage for a dangerous mission.

Loyalties are tested and hidden alliances are shifted as Smilla's secret mission unfolds at sea, and a startling truth threatens to shake up everything aboard the expedition.