Peter is a cheerful -- but not very obedient -- boy from a very ordinary family in pre-war Rotterdam. His many pranks amuse some and cause a lot of trouble to others, even making the front pages of the big city newspapers. His growing popularity brings him many new friends, but also some very powerful enemies.

Peter Bell and his Black Hand gang tangle with evil newspaper tycoon Stark once again, as the latter schemes to steal a priceless royal crown with his two cronies.

Casper has never met his father and lives alone with his mother Marit. He likes to spend his free time playing the piano, so he is thrilled when he is chosen to become a pianist in a youth orchestra – and especially when he makes friends with Anouk. She knows what Casper is going through when he learns that his mother is seriously ill: Marit has cancer. Scared of what might happen to her, Casper and his best friend Pim decide to find his father.