It was a movie on VHS that had a kid try to bust a man and woman robbers as owners of an ice cream truck

I remember there was a boy that was trying to bust the man and women operating the ice cream truck. He would look into the man’s wallet while a girl distracted him and put a walkie-talkie under the car seat to listen to what they were saying. Also the boy had to use a magnifying glass to burn the rope tied around his hands.