The series' original international English title was "Angie Girl" and the lead character's original name was Angie Islington. The series title and character were changed in many countries to emphasize the girl detective's relationship as Sherlock Holmes's niece.
Some episodes of Angie Girl were released in the United States as part of The Casebook of Charlotte Holmes. The stories were framed by live-action segments featuring actors Michael Evans and Bernard Fox playing the roles of Sherlock Holmes and John Watson.
The original concept for the series involved a gypsy girl travelling around Spain searching for her mother. It's unclear why the plot for the show changed to a British detective drama set in the 19th century involving Sherlock Holmes niece.