Auzou Book for my first investigations box set 13 the detective duel

Despite Enzo's reputation as a detective at school, his classmate Arthur didn't hesitate to challenge him to a detective competition! As the challenges unfold, Arthur proves to be very skilled at solving the mysteries… what is his secret? A box containing a never-before-seen novel, a magic pen, and 8 envelopes accompanied by 8 small cards to let the child play detective and hide clues!