Suspense fiction. Adventure and adventurers -- Fiction. Spy stories.

Theft from museums -- Fiction. Spy stories. Violin -- Fiction.

Code and cipher stories. Cryptography -- Fiction. Humorous stories.

Intelligence officers -- Fiction. Detective and mystery stories -- Fiction. Piazza San Pietro (Vatican City) -- Fiction. Spy stories. Suspense fiction.

Telegraph -- Europe -- Juvenile fiction. Boarding schools -- Europe -- Juvenile fiction. World War, 1914-1918 -- Juvenile fiction. Cipher and telegraph codes -- Juvenile fiction. Spy stories.

Spy stories. Families -- Juvenile fiction. Revenge -- Juvenile fiction. Young women -- Juvenile fiction. Friendship -- Juvenile fiction.

Teenagers -- Sexual behavior -- Juvenile fiction. Spy stories. Soldiers -- Juvenile fiction. Ambassadors -- Juvenile fiction. Young adult fiction.

Social psychology. Strangers.

World War, 1939-1945 -- Children's nonfiction. World War, 1939-1945 -- Miscellanea -- Juvenile literature. World War, 1939-1945 -- Secret service -- Children's nonfiction.

Ravens -- Juvenile fiction. Theft -- Juvenile fiction. Undercover operations -- Juvenile fiction. Adventure stories. Humorous stories.

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

Young women -- Juvenile fiction. Revenge -- Juvenile fiction. Spy stories.