The tween, Mads, finds it hard to fit in. Having feelings for a girl in class and a clumsy farther who is a teacher at his school doesn't help. By an unforeseen chance of events, Mads becomes somewhat of a hero, but will he win the girl?

The Krunborg family has new problems: a freshly painted house that won't dry, a tent with holes and a car that won't go anywhere and much much more.

Mads "Crumb" Krumborg need a new bike so he can take part in an important race against a neighboring school. But it will be difficult to afford to buy a new printer, since the boy's father suddenly decides to terminate his job to invent a machine that according to him will change the world. At the same time a couple of crooks wind of his father's invention, and when the family Krum Borg's future is in problems, Crumb and his siblings to the occasion and save the day.