Charly wants to find a guy who's known as `the stupid burglar' for activating an alarm while robbing a warehouse. A kitty called Mimi appears at Dandy's house unexpectedly. The kids keep Mimi while they look for her owner. The stupid burglar hits another warehouse ¿ and fails again. Charly & Co will make us of a school trip to visit the industrial park where the robberies happen. However, this time Dandy and Mimi lead the investigation, which turns to the alarm system company.