A documentary film crew investigates a series of brutal killings known as the Black Water murders. As they delve deeper into the story they stumble upon a horrifying secret, one that they may not survive.

A 6 y.o. Inuit boy runs off a snowy roof in Copenhagen and dies. Smilla, a half Inuit who lives in the building and knows the boy, looks into it. What makes an acrophobic boy run up on the roof? The clues take her to Greenland.