Retired teacher Ulla is celebrating her golden wedding anniversary with her husband Paul. Unfortunately, Ulla's romantic idea of renewing their vows backfires, as her husband has fallen in love with Ulla's best friend.

Bibi receives an invitation to the traditional witch Halloween of the old witches Mania, Walpurgia and Runzia. It's a huge honor - up until now, young witches have never been invited! But Bibi can only be half happy, because on the same evening she has planned a big appearance with Florian and Marita at the Halloween party in the town hall.