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 Castle of Horrors Three friends, Jupiter Jones, Bob Andrews and Pete Crenshaw, decide to found their own detective agency "Three Detectives" and They persuade the famous director Alfred Hitchcock to give them a task - to find a suitable haunted house for his future film. They found a suitable house, but it seems that there are real ghosts there?

In the Russian edition of 1992, the author of the book is listed as M. Carey.