The four young snoopers Tim, Karl, Kloesschen and Gaby by chance discover a hidden cave near an old castle. In it there's a board that seems to describe the way to a legendary sword. They ask their history teacher Schindler about it. He forbids them further actions, but secretly continues investigations with help of two ruthless criminals. But our young heros don't give up on an adventure so fast...
Unfortunately the movie Four Junior Detectives is not yet available on HBO Max.
| Writing | Inka-Maria Kalmuczak | Screenplay |
| Directing | Ulrich König | Director |
| Sound | Fritz Muschler | Original Music Composer |
| Editing | Hannes Nikel | Editor |
| Production | Patrick Zorer | Unit Manager |
| Production | Edward Erdmann | Production Runner |
| Production | Bernd Eichinger | Producer |
| Production | Balthasar von Weymarn | Production Runner |
| Writing | Rolf Kalmuczak | Book |
| Production | Peter Zenk | Executive Producer |
| Camera | Leander R. Loosen | Director of Photography |
| Camera | Dorothea Koerner | Assistant Camera |
| Production | Martin Moszkowicz | Executive Producer |
| Costume & Make-Up | Rosie Jurat | Costume Design |
| Sound | Frank Zander | Original Music Composer |
| Sound | Bernie Paul | Original Music Composer |
| Sound | Andreas Schneider | Foley Artist |
| Sound | Joo Fürst | Foley Artist |
| Production | Sabine Eichinger | Line Producer |
| Production | Dieter Meyer | Line Producer |
| Art | Matthias Kammermeier | Production Design |
| Production | Sabine Eichinger | Production Manager |
| Crew | Marc-Thomas Pohl | Set Production Assistant |
| Production | Robert Kulzer | Associate Producer |
| Lighting | Bernhard Fuss | Lighting Technician |
| Production | Renate Seefeldt | Production Accountant |
