Edie Kiglatuk, a summer school teacher in the Canadian arctic, enlists the help of Sergeant Derek Palliser when one of her female students is found dead in a nearby lake. Meanwhile, lawyer Sonia Gutierrez investigates the toxicity of the lake and suspects that there might be a larger conspiracy involved. As the three clamber over rocky terrain, they start to unearth secrets long frozen over--risking their own lives in the process.