Some early female detectives are featured this week on BBC Radio 7: American author Anna Katharine Green's socialite Violet Strange in "The Golden Slipper" (1915) and British writer Catherine Louisa Pirkis's Loveday Brooke in "The Redhill Sisterhood" (1893). Go here for the schedule or to listen.
About the photo: Anna Katharine Green, taken bet. 1870 and 1890. Library of Congress, Prints and Photographs Division.