Benny is angry. He's always just Britta's little brother. She is bigger and stronger than him and decides everything. But he wants to be the "decider" too.
Grandpa shows him the wish book. When he opens the book, he can wish for his own story. He experiences an exciting adventure with real dragons and a treasure. In the book, he is the hero, brings water into Britta's story and is even stronger than a dragon in the end.