Herbert Molin, a retired police officer, is living alone in a remote cottage in the vast forests of Harjedalen in northern Sweden. He has two obsessions: the tango and a conviction that someone is after him. He has no close friends, no close neighbours, and by the time his body is found, Molin is almost unrecognisable.
Stefan Lindman, a police officer on extended sick leave, hears of the death of his former colleague and, to take his mind off his own problems, decides to involve himself in the case. What he discovers, to his horror and disbelief, is a network of evil almost unimaginable in this remote district, and one which seems impossible to link to Molin's death.