B&W : Serial / 30 reels
Directed by George B. Seitz
Cast: Charles Hutchison [Larry ‘Hutch’ Hutchdale], Lucy Fox [Nancy Kellogg], Warner Oland [Clifton Marlow], Diana Deer [Belle Brinkley], Ann Hastings [Ann Haviland], Harry Semels [Jim Tiegerley], Frank Redman [John Brinkley], Tomas G. Goodwin (Tom Goodwin) [Silas Haviland], Charles Revada [Bill Hogan], Joe Cuny [Wilson Winslow; and Hutchison stunt double], Joe Bonomo [stunt double], Frank Hagney [stunt double], Spencer Gordon Bennet [stunt double], George B. Seitz [stunt double]
George B. Seitz Productions production; distributed by Pathé Exchange, Incorporated [Pathéserial]. / Produced by George B. Seitz. Scenario by Charles Hutchison, from a screen story by Charles Hutchison. / 15 episodes (two reels each):  “The Secret Cipher,” released 25 September 1921;  “The Cycle Bullet,” released 2 October 1921;  “The Last Duel.” / Standard 35mm spherical 1.33:1 format.
Survival status: The film is presumed lost : A trailer for the film exists in the Library of Congress film archive.
Current rights holder: Public domain.
Listing updated: 20 August 2017.
References: Lahue-Continued pp. 93, 221-222, 285; Stedman-Serials p. 42 : ClasIm-204 p. 33 : Website-IMDb; Website-SerSq.
Home video: DVD.