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 Goblin Mirror Three detectives are trying to understand how a ghost can appear from an antique and ugly, but still a mirror. Even if it is the ghost of the mirror's former owner.

P.S. The book was published in the "Horror" series, but this is not a horror story, but a children's detective story, from the "Three Detectives" series.