Two young BMX experts, P.J. (Angelo D'Angelo) and Goose (James Lugton), meet Judy (Nicole Kidman), who is working as a trolley collector at the Warringah Mall during the school holidays in order to be able to buy her own BMX bike, and accidentally get Judy fired from her job when they crash into trolleys pushed away by the local "Creep" (Brian Sloman). The three go out in Goose's dad's runabout on the harbour searching for cockles to sell in order to fix their own crashed bikes, as well as getting Judy her own, and stumble onto and steal a box of police-band walkie talkies that the bank robbers were hoping to use to monitor on police traffic. After stealing the box, the kids pass Whitey and Moustache who are on their way in their high-powered motorboat to pick it up.