A mysterious serial killer is shocking the underworld. Scotland Yard is investigating the case. Clues lead the detectives to Blackwhite Castle.
Bibi Blocksberg is a normal little girl - although she can do magic she still has a lot to learn. She's always full of entertaining ideas, one little "Wizz-wizz" and a problem is solved or maybe it's just the start of one.
When a scuffle breaks out between the members of a criminal youth gang, one of them is stabbed to death. Since the knife belongs to the gang member Rocky, the judge assumes that he must have stabbed him too and sentences him to six years in prison. When he is released, he immediately sets off in search of the real culprit.
