Art Conan Doyle and the disappearing dragon

Arty Conan Doyle and his best friend Eddie Hamilton, nicknamed Pig, take up a new investigation. Someone in broad daylight stole a giant mechanical dragon from a super-secret and protected warehouse! The creator of the device, Professor Anderson, the Great Magician of the North, in despair! Young detectives will have a difficult work: find the abducted dragon and bring the criminal into the clean water. But how to do that? After all, there is not a single clue, and from the evidence only a strange note that even more confuses everything. None of the adults can help boys. Dad is too busy in the service, and the good old sergeant McCorkle does not believe that the dragon was stolen.
For secondary school age