Yes, but not only. The plot also comes second as we are absorbed by the discovery of this Lappish world, with its culture and customs of another time. The Sami are primarily a reindeer herders and their living and working in the cold and the night is quite exceptional, and perfectly described. Tensions that there is between the Sami and the Norwegians / Swedish / Finnish are also explained through short incursions in the past. This environment brings "naturally" darkness and mystery to the plot, which effectively mixes the ingredients and the police this amazing universe.
