A guide to writers of Nancy Drew books for Mega-Books provides details on the scope of the modern series. The procedures were different from those used by the Stratemeyer Syndicate.
Ghostwriting in the Mega-Books era
With all of its secrets, more is known about the Stratemeyer Syndicate than is known about the book packager that followed them, Mega-Books, after Simon & Schuster bought the Syndicate.