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.
| Actor | Role |
|---|---|
 Olle JohanssonKalle Blomkvist | Kalle Blomkvist |
 Sven-Axel CarlssonAnders Bengtsson | Anders Bengtsson |
 Ann-Marie SkoglundEva-Lotta Lisander | Eva-Lotta Lisander |
 Bernt CallenboSixten | Sixten |
| UUlf Törneman-StenhammarBenka | Benka |
| RRoberto GüntherJonte | Jonte |
 Henrik SchildtUncle Einar | Uncle Einar |
 Sigge FürstConstable Björk | Constable Björk |
 Carl ReinholdzFredrik med foten | Fredrik med foten |
 Fritiof BillquistDetective Inspector Stenberg at the State Police | Detective Inspector Stenberg at the State Police |
 Magnus KessterTore Krok, alias Arthur Berg | Tore Krok, alias Arthur Berg |
 Peter LindgrenIngvar Redig, alias Tjommen | Ingvar Redig, alias Tjommen |
 Solveig HedengranMia Lisander | Mia Lisander |
 Björn BerglundKalle's Father | Kalle's Father |
| GGösta JonssonErik Lisander | Erik Lisander |
 Anna-Stina WåglundKalle's Mother | Kalle's Mother |
| BBirger SahlbergConstable on Duty at the Police Station (uncredited) | Constable on Duty at the Police Station (uncredited) |
 Hugo TranbergThe Hotel Porter (uncredited) | The Hotel Porter (uncredited) |