Ruth Roland
Ruth - The Girl Detective
Cleo Ridgely
Marguerite Wheeler
Marin Sais
Bertha - The Girl Detective
Edward Clisbee
Chief of Police Harding
Paul Hurst
(Episode #1, 2, etc.)
R. Henry Grey
The Girl Detective's Assistant
William H. West
Deacon - the Multimillionaire
James W. Horne
Thomas G. Lingham
Jarvis - Head of the F.O.B.A.