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 on the calendar. Great gimmicks for detective role-playing or for fans of The Three ???. The countdown to 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 each day and solve puzzles. The correct solution and the corresponding image will show them which door to open next on the Advent calendar. Each day hides a small reward. The pre-Christmas season has never been this exciting! 24 cool detective gimmicks for fans of The Three ??? and instructions with a detective story and puzzles. Additional materials needed: scissors, craft glue, fiber markers or stamp pads, as well as other common household materials. Warning: Not suitable for children under 8 years. Use under adult supervision. Read instructions before use, follow them, and keep them handy for reference.