One day the Spanish Ambassador moves into the house next-door to Madeline's school. And he brings with him his son a BOY. Pepito, the Bad Hat, as Madeline calls him, is a boy with a capital "B". Sticks and stones are nothing compared to Pepito's antics. Despite all efforts by Madeline and crew to teach him to tame him, he follows each dastardly deed with another that's much worse, until... one day he goes too far, and with Madeline's help and anticipated friendship must learn his lesson.