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Lotta's grandparents are celebrating their golden wedding with the whole family in the old Strullenstein Castle in Bridelgau. Lottie's dad has already come up with a bunch of fun activities: a game called "Good Hunting", walks and an expedition to the Bat Cave. But the worst part is that Lotte and her foolish brothers have to sing at the party in front of all these people! Besides, the shameless cousin Lasse will probably mock them again. But it's a good thing that two new cousins will be there: Amelia and Olivia from Australia! Who knows, maybe with them the holiday won't be so bad after all.