In the second part of the successful children's book adaptation, Franz, Gabi and Eberhard go on a turbulent hunt for criminals during the summer holidays – and uncover a completely different secret in the process.
| Actor | Role |
|---|---|
| JJossi JantschitschFranz | Franz |
| NNora ReidingerGabi | Gabi |
| LLeo WachaEberhard | Eberhard |
| MMaria BillFrau Berger | Frau Berger |
| MMaria SoilicaParwin | Parwin |
 Ursula StraussFranz' Mama | Franz' Mama |
 Katharina HaudumSonja | Sonja |
 Christian HolzmannObdachloser | Obdachloser |
 Simon SchwarzFranz' Papa | Franz' Papa |
 Rainer EggerLehrer Zickzack | Lehrer Zickzack |
 Julia EdtmeierGabis Mutter | Gabis Mutter |
 Deniz CooperGabis Vater | Gabis Vater |
| RRocco BaldariMichi | Michi |