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In page Nancy Drew:

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In 1985, as the sale of the Stratemeyer Syndicate to Simon & Schuster was finalized, Simon & Schuster wanted to launch a spin-off series that focused on more mature mysteries and incorporated romance into the stories. To test whether this would work, the final two novels before the sale, The Bluebeard Room and The Phantom of Venice, were used as backdoor pilots for the new series.[citation needed]