A young American girl is found dead in Gota Kanal, Swedens largest channel. Since there are hardly any clues or evidence at all it seems as if the murder cant be solved. Martin Beck and his men are assigned to the case. Soon they find a likely suspect and together with a police woman they begin a cat and mouse game to catch him. Plot by Mattias Pettersson.
as Martin Beck
as Lennart Kollberg
as Gunvald Larsson
as Benny Skacke
as Åsa Thorell
as Per Månsson
as Einar Rönn
as Evald Hammar
as Folke Bengtsson
as Inga Beck
as Putte Beck
as Greta Hjelm
as Kristiansson
as Colonel's wife
as Göta Isaksson
as Karin Larsson's mother
as Girl with a fishing rod
as Erik Beck
as Roseanna
as Karl Åke Eriksson
as Kvant
as Inspector Kafka
as The colonel
as Mylvaney
as Man in a wheelchair (uncredited)
as Police Secretary in Motala (uncredited)
