With an exciting detective story featuring Justus, Peter, and Bob. One chapter for each day leading up to the resolution of the case by Christmas. A tricky puzzle whose solution leads to the next door. Great gimmicks for detective role-playing or for fans of The Three ???. The time until Christmas - completely without chocolate. Is there a ghost haunting the abandoned airfield? Where does the eerie howling in the hangar come from? Will the three ??? manage to catch the smugglers before Christmas? Justus, Peter, and Bob have only 24 days! Together with their friends from Rocky Beach, children aged eight and up will start the investigation. They will read a chapter of the thrilling detective story every day and solve puzzles. The correct solution and the corresponding image will show them which door to open next in the Advent calendar. Every day, a small reward is hidden there. The pre-Christmas season has never been so exciting! 24 cool detective gimmicks for fans of The Three ??? and instructions with a detective story and puzzles. Additional materials needed: scissors, craft glue, felt-tip pens or stamp pads, as well as other common household items. Warning: Not suitable for children under 8 years. Use under adult supervision. Read, follow, and keep the instructions handy before use.