The Girl Detective

Ruth Roland Ruth, The Girl Detective

Marin Sais Bertha, the Girl Detective

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

Edward Clisbee Chief of Police Harding

Arthur Shirley John Talcott

William H. West Rumson / Strumfsky / Isaacson / Fairfax / Marsden / Rankin / Deacon / Merriman / Craven / Kerrigan / Brandon / Dr. Barry

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

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

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

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

R. Henry Grey Rodger Hastings / Harry Warrington

Thomas Galligan Peters / Thompson

Alice Meyer Marie

James W. Horne Blaney

J. Schneider Chad

Evelyn Wayne Ray, Brandon's Daughter