The Sami reindeer herders are gathering for their customary annual trek to the summer pastures. For Oslo police academy trainee Ravna Persen, those weeks in the Arctic Circle far from civilisation are mandatory. But there’s tension among the clans, and some people aren’t too happy that Ravna has joined the police force.
One day, Ravna is injured while trying to track down stray reindeer. A girl comes to her aid, but disappears before she has a chance to thank her. The next morning, Ravna tries to find out who she was, and is told that she was reported missing seven years ago. Can it really have been the same girl? Shortly afterwards, a girl’s dead body is discovered, and Ravna decides to investigate – but the weather turns before backup can arrive, and the summer pastures are cut off from the outside world.