In the magic school Simbalablitz, the numbers have disappeared! Everywhere! From the classroom doors, from the books, and even from the students' heads. There's no way to think about lessons anymore: the spells no longer work, the cook can't read her recipes, no one can find the right classroom, and how are the magic students supposed to open their books to the right page?! Marlon, Clarissa, Elmar, and the other students of the second magic class initially find the wild chaos fantastic. But soon the children realize that numbers are quite useful. What time do the students need to fly home? No idea! Buying a specific amount of firecrackers at the school kiosk? Not possible! And what is a wizard without a functioning spell? Marlon, Clarissa, and Elmar must find the numbers again, but that presents them with a great puzzle at first.