The Dana Girls was a series of young adult mystery novels produced by the Stratemeyer Syndicate. The title heroines, Jean and Louise Dana, are teenage sisters and amateur detectives who solve mysteries while at boarding school. The series was created in 1934 in an attempt to capitalize on the popularity of both the Nancy Drew Mystery Stories and the Hardy Boys series, but was less successful than either. The series was written by a number of ghostwriters and, despite going out-of-print twice, lasted from 1934 to 1979; the books have also been translated into a number of other languages. While subject to less critical attention than either Nancy Drew or the Hardy Boys, a number of critics have written about the series, most arguing that the Dana Girls' relative lack of success was due to the more dated nature of the series. Source: Wikipedia (en)