As always, orderly chaos reigns in Crumb's family. Crumb wants to join the school race to impress Yrsa. However, he does not have a bike. Crumb's sister, Stine, is going on a field trip to Paris, but does not have the money to pay for the trip. In addition, she needs clothes. Their parents promise to pay when they win the lottery. Dad quits his job as a teacher because he wants to become an inventor. Two fraudsters are trying to get them kicked out of their home and steal dad's newly invented device. No wonder Crumb thinks it is hard to be 11 years old.

The fifth installment in the popular children’s series Crumbs.