The Hardy Boys Casefiles series was mostly geared toward an older reader as compared to many other Hardy Boys series. The very first book in the series helped set the stage for its older target audience by killing off Joe's long time girlfriend Iola Morton in the very first chapter. This series crossed over with both Nancy Drew in the Nancy Drew and Hardy Boys SuperMysteries and Tom Swift in the Hardy Boys and Tom Swift Ultra Thrillers. You can find the titles, cover images, artists, authors, plot summaries, and more via the links below.