Ms. Janis' house is under renovation and she asks Charly & Co whether her dog Nino can stay with Dandy for some days. Dandy has to babysit him! That same day, a graffiti appears in the school facade. In the meantime, the municipal police is looking for the so-called `thief of the white stocking' who holds up bank vans. While Charly & Co investigate the graffiti, detective Dandy and his assistant Nino will discover the link between the graffiti and the thief!