Every morning Håkan von Enke takes a walk in the forest near his apartment in Stockholm. However, one winter's day he fails to come home. It seems that the retired naval officer has vanished without trace.

Detective Kurt Wallander is not officially involved in the investigation but he has personal reasons for his interest in the case as Håkan's son is engaged to his daughter Linda. A few months earlier, at Håkan's 75th birthday party, Kurt noticed that the old man appeared uneasy and seemed eager to talk about a controversial incident from his past career that remained shrouded in mystery. Could this be connected to his disappearance? When Håkan's wife Louise also goes missing, Wallander is determined to uncover the truth.