Engineers -- Fiction. Crime -- Juvenile fiction. Mystery and detective stories. Holmes, Sherlock -- Juvenile fiction. Watson, John H. (Fictitious character) -- Juvenile fiction.

Crime -- Juvenile fiction. Extortion -- Juvenile fiction. Mystery and detective stories. Holmes, Sherlock -- Juvenile fiction. Watson, John H. (Fictitious character) -- Juvenile fiction.

Boarding schools -- Juvenile fiction. Library technicians -- Juvenile fiction. Schools -- Juvenile fiction. Libraries -- Juvenile fiction. Mystery and detective stories.

Missing persons -- Juvenile fiction. Princes -- Juvenile fiction. Detective and mystery stories.

Hardy Boys -- Juvenile fiction. Detective and mystery stories. Mystery and detective stories.

Hardy Boys -- Juvenile fiction. Outlaws -- Juvenile fiction. Mystery and detective stories.

Hardy Boys -- Juvenile fiction. Counterfeits and counterfeiting -- Juvenile fiction. National security -- Juvenile fiction. Detective and mystery stories.

Mice -- Juvenile fiction. Theft -- Juvenile fiction. Necklaces -- Juvenile fiction. Mice -- Fiction. Stealing -- Fiction.

Crown jewels -- Great Britain -- Juvenile fiction. Theft -- Juvenile fiction. Detective and mystery stories. Humorous stories. Mystery and detective stories.

Owls -- Juvenile fiction. Animals -- Juvenile fiction. Pumpkin -- Juvenile fiction. Sharing -- Juvenile fiction. Diaries -- Juvenile fiction.

School children -- Comic books, strips, etc. School children -- Juvenile fiction. Elementary schools -- Comic books, strips, etc. Elementary schools -- Juvenile fiction. Lost articles -- Comic books, strips, etc.

Holmes, Sherlock -- Juvenile fiction. Watson, John H. (Fictitious character) -- Juvenile fiction. Crime -- Juvenile fiction. Betrayal -- Juvenile fiction. Detective and mystery fiction.