The Nancy Drew and Hardy Boys SuperMystery, is a series of novels that feature both the Hardy boys, and fellow Stratemeyer Syndicate character Nancy Drew. The first book in the series, Double Crossing was published in June of 1988; the series was discontinued in April 1998, with the publication of volume 36, Process of Elimination. Unlike other Nancy Drew/Hardy Boys crossovers, this series was not written using both the Carolyn Keene and Franklin W. Dixon pseudonyms, but only using the Carolyn Keene name.