In Self-Defense

Frank and Joe Hardy investigate when danger threatens Bayport's new self-defense school and find themselves up against a ruthless real-estate developer out to buy the building in which the school is located.

• Author
• Franklin W. Dixon, Anne Greenberg, Ann Greenberg

• Format
• paperback

• Pages
• 160

• Series
• The Hardy Boys Casefiles

• Publisher
• Simon Pulse

• Language
• english

• ISBN
• 9780671700423

• Genres
• mystery, fiction

• Release date
• 1990