Ten-year-old Ole is full of mischief. He attempts to fly and is hospitalized with a broken leg. When he sees a Sherlock Holmes movie on TV, however, he forgets about the pains and comes up with a new plan. Disguised as Sherlock Holmes and Dr. Watson, he and his friend Andreas start searching for criminals. Soon, the two boys detect their first case. On the street they meet a man wearing a stuck-on beard. The hobby detectives find this very suspicious and decide to follow him.
Unfortunately the movie Unternehmen Geigenkasten is not yet available on HBO Max.
| Directing | Gunter Friedrich | Director |
| Editing | Vera Nowark | Editor |
| Production | Siegfried Kabitzke | Producer |
| Camera | Günter Heimann | Director of Photography |
| Writing | Gunter Friedrich | Writer |
| Writing | Anne Goßens | Writer |
| Sound | Bernd Wefelmeyer | Music |
