Eleven-and-a-half-year-old Péter Pete wakes up to find that he can barely fit on the bed. Two furry legs peek out from under his blanket, his hands are huge, and his voice is deep and raspy. It seems that Pete Péter, aka Pie, grew up overnight and became just like his father. In addition, his father, Dr. Ádám Pete has also changed and resembles his son until he speaks. Even after speaking. So father and son walk in the same shoe. Or in each other's shoes. Pie goes to work instead of school. Ádám is waiting for the school bench. But can Pie hold his own in a serious workplace? And how does Ádám fare among the children? They'll have a good laugh about it one day, once they've changed back. But will they ever change back?