Autumn is coming, and Petronella is busy with the apple harvest. Then the twins, Lea and Luis, bring terrible news: the nasty baker Kümmerling wants to buy the Müller house. The garden is to be destroyed, and a parking lot is to be built in its place. This can't be true! But Kümmerling has underestimated the children and the little witch: while the apple men set up all sorts of traps to protect the garden, Petronella, Luis, and Lea come up with a brilliant plan to put an end to Kümmerling once and for all. Luckily, the little witch can also lend a hand with a bit of magic.