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