The holidays are just around the corner, but before that, Lasse's and Maja's detective instincts are needed. When three well-known personalities from Valleby give a presentation at school, something seems off. Can readers guess what it is? Additionally, this volume contains many exciting puzzles and interactive pages: learn to write secret messages, participate in the Valleby quiz, go on a treasure hunt, and bake your favorite recipe from the famous Valleby café Panini & Bernard.