The three detectives are his young friends Bob Andrews, Pete Crenshaw and Jupiter Jones. They live in a town near Hollywood. Their stronghold is a salvage warehouse, their headquarters is an old caravan in which they have equipped a crime laboratory. Their agency "Three Detectives" reveals any secrets, riddles and puzzles. Friends-detectives boldly take on the most important and complicated cases and bring them to the end with honor.

The mystery of the clever car thieves is every minute for Jupiter Jones. His cousin, Ty Cassie, is suspected of car theft. The Chief Detective considers it a matter of honor to prove that the relative is not guilty. Having started the investigation, he suspected that the trail led to a suspicious rock band that had appeared in the city. This time, the talents of his friends come in handy: Pete is well versed in cars, and Bob is a connoisseur of popular music.