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      The Secret of Sigma Seven

      by Franklin W. Dixon
      Published
      Oct 1991
      Main Genre
      Amateur Sleuth Amateur Sleuth
      Pages
      160
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      Series
      Hardy Boys Mystery Stories Book 110

      About This Book

      The aliens are invading! No, they're not from another galaxy. They're not even from Mars. They're from Hollywood! A science fiction convention has come to Bayport, and movie director Simon Devoreaux has lost his billion-dollar baby—the film of his latest blockbuster has disappeared before his eyes. The Hardy boys are out to find the film before it's too late!

      Series Placement

      Book 110
      🟡 Mostly Standalone
      View full series order

      Genres & Themes

      Genres

      Suspense

      Subgenres

      Amateur Sleuth

      Age Level

      Kids (12 & Under) Kids: Middle Grade

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      Formats & Editions

      Browse the different covers, formats, and publication history for this title.

      Paperback

      Paperback edition cover
      Paperback
      Oct 1991 Minstrel ISBN13 9780671727178 ISBN10 0671727176
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      Hardcover

      Hardcover edition cover
      Hardcover
      Jan 1991 Turtleback Books ISBN13 9780606050111 ISBN10 0606050116
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      Hardcover edition cover
      Hardcover
      Oct 1991 Turtleback Books ISBN13 9780613102858 ISBN10 0613102851
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      eBook

      eBook edition cover
      eBook
      Mar 2014 Aladdin ISBN13 9781481421973 ISBN10 1481421972
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      eBook edition cover
      eBook
      Mar 2014 Aladdin ISBN10 B00GKKTXB6
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