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.
Unfortunately the movie Mästerdetektiven Blomkvist is not yet available on HBO Max.
| Camera | Rune Ericson | Director of Photography |
| Art | Bibi Lindström | Production Design |
| Writing | Astrid Lindgren | Book |
| Sound | Jules Sylvain | Original Music Composer |
| Sound | Gunnar Johansson | Original Music Composer |
| Writing | Rolf Husberg | Writer |
| Editing | Rolf Husberg | Editor |
| Directing | Rolf Husberg | Director |
| Production | Schamyl Bauman | Producer |
