The brutal murder of a French citizen sees French homicide investigator Kahina Zadi (Leïla Bekhti) go to Kiruna, Sweden. Together with Rutger Burlin (Peter Stormare) she begins an investigation that soon takes on staggering proportions.

In an industrial and labyrinthine seaside town, people ignite suddenly with no reason. Suicides? Murders? Supernatural phenomena? To find out, Louise, a young journalist, and Gabriel, a psychiatrist, will investigate.