Title: The Hydrofoil Mystery
Subjects: Juvenile fiction, Romans, nouvelles, etc. pour la jeunesse, World War, 1914-1918, History, Hydrofoil boats, Sabotage, Spy stories, Detective and mystery stories, Guerre mondiale, 1914-1918, Histoire, Hydroptères, Espions, Roman policier, Children's fiction, Inventors, fiction, Mystery and detective stories
Places: Nova Scotia, Baddeck (N.S.), Nouvelle-Écosse, Baddeck (N.-É.), Baddeck
People: Alexander Graham Bell (1847-1922)