It's summer. Kalle, Eva-Lotta and Anders have formed a gang, the White Rose. They are in playful battle with Red Rose gang. A relative of Eva-Lotta's mother, Uncle Einar, come to visit and Kalle notice immediately that he is behaving strangely. Einar seems to have hidden something in a closed mine outside town. Two mysterious strangers appear.
as Kalle Blomkvist
as Anders Bengtsson
as Eva-Lotta Lisander
as Sixten
as Benka
as Jonte
as Uncle Einar
as Constable Björk
as Fredrik med foten
as Detective Inspector Stenberg at the State Police
as Tore Krok, alias Arthur Berg
as Ingvar Redig, alias Tjommen
as Mia Lisander
as Kalle's Father
as Erik Lisander
as Kalle's Mother
as Constable on Duty at the Police Station (uncredited)
as The Hotel Porter (uncredited)
