The Girl Detective

Ruth Roland

as Ruth, The Girl Detective

Marin Sais

as Bertha, the Girl Detective

Cleo Ridgely

as Kate Rumson / Mrs. Rodger Hastings / Olga / Queenie / Molly Moran / Jean, The Girl Detective

Edward Clisbee

as Chief of Police Harding

Arthur Shirley

as John Talcott

William H. West

as Rumson / Strumfsky / Isaacson / Fairfax / Marsden / Rankin / Deacon / Merriman / Craven / Kerrigan / Brandon / Dr. Barry

Paul Hurst

as Blair / Thompson / Michaels / Snake Henely / Mike Donegal / Bat Dorgan / Kelly / Dalton / Blake

Ollie Kirby

as Mrs. Churchill / Emily Wharton / Mary Kerrigan / Marie / Mrs. Winslow / Mabel Keene / Mrs. Cluett

Thomas G. Lingham

as George Warren / Machson / Doran / Rat Hogan / Ripert Bladeau / Jarvis / Breslow / Jeffries / Rillando / Dr. Keene

Frank Jonasson

as McGregor / Buck Donegal / Fourteen-Carat Tommy / Henri Bladeau / Turner / Denton / Jordan / Scotty Weed

R. Henry Grey

as Rodger Hastings / Harry Warrington

Thomas Galligan

as Peters / Thompson

Alice Meyer

as Marie

James W. Horne

as Blaney

J. Schneider

as Chad

Evelyn Wayne

as Ray, Brandon's Daughter