A wonderfully quirky family - the first adventure of the Buddenbergs. Nine-year-old Mia has the most bustling patchwork family one can imagine. There's her big goth brother, the wild little twins, her lovingly chaotic mother, the grumpy yet good-hearted grandpa, various fathers, and of course, Mia's so-called sister and best friend Lisbeth. It's no wonder that there's always something happening with the Buddenbergs, as they stumble from one adventure to the next. To keep track of all the chaos, Mia documents everything on maps in her diary. This story actually begins on the day a hundred-year-old letter from London arrives for Mia and her family. However, the Buddenbergs have no idea that this letter is a real sensation. As a result, it almost gets lost in the usual Buddenberg chaos, even though it leads to a secret hideout.