As always, things never go smoothly with the Krumborg family. The mother must further her education from a child educator to a leader, otherwise she will be fired, because only people with such an education may run a kindergarten. Dad has problems with all the many rules at school, he would rather just teach crafts and experiment with his inventions. So he resigns as a teacher, and instead wants to work as an inventor, he gets help from Grunk. Stine is going on a school trip to Paris, but is missing clothes. Krumme, he dreams of a bike so he can take part in the mountain bike competition against the neighboring school.