This 2019 family-appropriate adventure film was popular enough to get a TV series, which started in 2023.
Jürgen Vogel is a familiar face here (assuming you can recognize him with hair!). You may also recognize Hinnerk Schönemann, Sylvester Groth, and Armin Rohde.
As a film rated 0 in Germany, it is a family friendly (and therefore classroom friendly), but doesn’t read as young as other films with the same rating. It is a gender-swapped version of Die Drei ??? And as such, the main characters are a group of female friends, who appear to be in their young teenage years. Some major themes are teenage love and relationships, justice (particularly for girls), even homelessness and family dynamics.