Grandfather has finished the Devil’s Bridge and the whole village is ready to celebrate. Dete and Sebastian are here for the event, but Dete and Grandfather are at loggerheads, still disagreeing on what happened with Heidi when Dete took her to Frankfurt.
Heidi and Clara (who will go back to Frankfurt with her family the very next day) have organised a picnic in the mountains to try and see some edelweiss flowers.
As everyone looks for edelweiss, Dete and Grandfather argue and Dete leaves with Sebastian to explore the mountains on their own. Sebastian comes a cropper and when Grandfather saves him, Dete understands that he is not such a bad man.
Thanks to Heidi’s good spirits, the whole family ends up reunited at the bridge’s grand opening, and the whole village decides to rename the bridge after Grandfather and Tobias.