Ulf is plump, clumsy and taciturn, he's not really the type to get into trouble and, as if that wasn't enough, he continually suffers harassment from his older brother. Nothing to do with Percy, the new student with the crew cut and iron fists.
Percy does and says what he wants, he is agile, fast and good at everything (even sewing!). One day, after yet another gaffe from Ulf, Percy reveals to him the deepest of his secrets: it's his shoes (those smelly, very old sneakers he always wears) that make him so reckless!
Thus begins Ulf's attempts to grab the coveted trophy and become the bold and indomitable boy he has always dreamed of being... but are we sure it's a good idea?