Nancy Drew: Girl Detective is a 2004–2012 book series which replaced the long-running Nancy Drew mystery series. This new series is written in first person narration, from Nancy's point of view, and features updated versions of the main Nancy Drew characters. New secondary characters are introduced to populate River Heights and appear over multiple books, adding a framework to Nancy's world.
Though this series has many improvements over the Nancy Drew Mystery Stories, the drastic change in the main characters' personalities was hard for many readers to accept. The series was negatively reviewed by many fans of the series, mainly over the change in Nancy's character. In 2008, the series was changed into a trilogy format, which gained even more negative reviews than before. Simon & Schuster cut back to 4 books a year in 2010, before low sales finally forced the cancellation of the Girl Detective series in 2011. In 2013, the Nancy Drew Diaries series was launched as the replacement for Girl Detective.