Chief of Investigation of Unit One, Torben Rønne, is found murdered in his house along with Henning Ravn, a friend of his who was temporarily living at Torben's. Ingrid Dahl is promoted to temporary Chief of Investigation to support Unit One. Because of information provided by a criminal, Unit One locates Dennis Friis, the son of a woman Ravn used to date years back. As Friis tries to pick up the murder weapon, he is discovered by Fischer and La Cour and taken in to custody. He confesses the crime under questioning with Dahl. (thetvdb.com)