Spring is back and Peter and Heidi are ready to reopen the treehouse, which had been closed all winter. But Peter realises that his treasure, that he kept in the shed near his cabin, has disappeared.
One afternoon, Karl contemplates Peter’s treehouse (William has lead him and Theresa there) and he decides to attack it.
Peter and Heidi are back in the meadows and Heidi is now so good with the goats that she asks Peter to become a Goat General just like him.
Led by her Aunt Dete, Heidi arrives in the village of Dörfli to live with Uncle, her grandfather.