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 Dragon with a Cold Heartbreaking groans echoed throughout the desert valley. There were dark rumors about this, and local residents tried to stay away from here. Three detectives - Jupiter Jones, Pete Crenshaw and Bob Andrews managed to unravel this ominous mystery.

The book contains illustrations.