The frst female detective appears in W. S. Hayward’s Revelations of a Lady Detective (1861). Other female detectives graced the pages of Andrew Forrester Jr.’s The Female Detective (1864), Clarence Rook’s The Stir Outside the Café Royal (1898), Beatrice Heron-Maxwell’s The Adventures of a Lady Pearlbroker (1899), Grant Allen’s Miss Cayley’s Adventures (1898) and Hilda Wade (1899). However, female patrol officers were not allowed in the Metropolitan police force until 1919.