This 15 chapter serial is considered to be "the last of the adult serials". Produced in Wilkes-Barre, PA., it has crisp editing, fast action, and carefully lit and composed interiors and lush pictorial exteriors. This is a serial of great complexity with the director, the photographer and title-maker always in absolute control. The extraordinary rhythmic momentum of the film is never lost despite the films complex plot turns. This is the best of the surviving serials from the silent era.
| Actor | Role |
|---|---|
 Arline PrettyRuth Hope, The Woman in Grey | Ruth Hope, The Woman in Grey |
| HHenry G. SellTom Thurston, Amory's Attorney | Tom Thurston, Amory's Attorney |
| FFred C. JonesJ. Havilland Hunter, A Man of Mystery | J. Havilland Hunter, A Man of Mystery |
| JJohn HeenanWilfred Amory, Retired Attorney | Wilfred Amory, Retired Attorney |
| MMargaret FieldingPaula Dunne, Amory's Niece | Paula Dunne, Amory's Niece |
 Ann BrodyMiss Traill, Companion to Ruth Hope | Miss Traill, Companion to Ruth Hope |
| JJane MairGrace Carleton | Grace Carleton |
| JJack NewtonRalph Gordon | Ralph Gordon |
| JJ.W. DriscollDr. Lepell | Dr. Lepell |
 Jack ManningGangster | Gangster |
| WWalter ChapinGangster | Gangster |
| VViolet De BiccariNot listed | Not listed |
| AAdelaide Fitz-AllenNot listed | Not listed |
 Marguerite NamaraNot listed | Not listed |