A dark and foggy night in 1892 yeoman Sol Lars Jonsson disappears in Dalarna. He is found six months later, floating in the river Vanån. Who is behind the murder? With the help of archived material, court records and coroner Eva Rudd, investigator Göran Olsson and genealogist Leif Mörkfors, David Lagerkrantz breathes new life into an old criminal case.