It is about the crime-fighting adventures of three women working in a private detective agency in Los Angeles, California. It originally starred Kate Jackson, Farrah Fawcett , and Jaclyn Smith in the leading roles and John Forsythe providing the voice of their boss, the unseen Charlie Townsend. David Doyle played John Bosley. After Fawcett and Jackson left, they were replaced by Cheryl Ladd, Shelley Hack, and Tanya Roberts.