Conceived By Edward Stratemeyer, And Ghost-Written By Many Authors Under The Pseudonym Carolyn Keene, Which Teenage Sleuth First Appeared In The 1930 Novel The Secret Of The Old Clock?

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1. Conceived By Edward Stratemeyer, And Ghost-Written By Many Authors Under The Pseudonym Carolyn Keene, Which Teenage Sleuth First Appeared In The 1930 Novel The Secret Of The Old Clock?