Fakirs, acrobats, magicians, and clowns - there's a lot in store during the circus project week at your school! In groups, all the children prepare for the big final performance, and you get to join the Radio Pirates. For a radio show, you conduct interviews for a week and get a taste of circus life. Unfortunately, you can't stay overnight in the circus tent like your classmates. So, you sneak out of the house at night, but you get caught and receive a grounding. When mysterious whispering voices suddenly appear on a nighttime tape recording, planning a break-in at the school, you have to decide: will you tell the other Radio Pirates or keep your secret to yourself for now? You inform the other Radio Pirates, and with the help of the circus performers, you manage to stop the burglars in a spectacular night-and-fog operation.