Thirsa's parents are divorced. Now "uncle" Walter and his annoying son Theo suddenly live with her. Thirsa misses her father and her sweet, forgetful grandmother, who sometimes thinks that the Second World War is not over yet. During the war, grandma lost her great love, which sometimes still makes her sad. Thirsa and her two best friends - the funny Joep and the smart Eric - come up with a plan to make grandma happy again. Unintentionally, the three friends get caught up in a turbulent adventure that is not only about the Second World War, but also about a magical drawing pad, a ghost plane and a cool girl who wants to be a pilot.