The Coltao and the Humans live peacefully on the planet Nerthus, but the Humans have been told to never approach the Coltao city as their shared planet approaches aphelion, and the Humans have always listened...until a young human named Dag decides he wants to find out what the Coltao are up to. He will face terrible dangers as he crosses the frozen landscape, and nothing can prepare him for what he finds when he reaches the Coltao city.