Penny is organizing a picnic lunch. But she needs the hamper to put everything in. She goes to Archie's castle to fetch it. Archie had made it into a musical hamper. It plays a different tune every time you open the lid. When Penny brings it back, there is no sign of the picnic lunch. She calls in PC Plum to find out where it had gone. Suzie solves the mystery. She remembers that she'd sold PC Plum the food for the picnic. PC Plum returns everything, and the children go on a picnic. They eat, drink and play musical statues to the sound of Archie's amazing musical hamper.