Jack Holt / Nick Farrell
Jack Holt
Kay Drew
Evelyn Brent
Agent Jim Layton
Edward Hearn
Agent Frank [Chs. 3-5, 8-9, 15]
Jack Cheatham
John Severn - Engraver [Chs. 1-4]
Ray Parsons
'Lucky' Arnold
John Ward
Quist
Ted Adams
'Crimp' Evans [Chs. 1, 4-15]
Joe McGuinn
Ed Valdin [Chs. 1-10]
Tris Coffin
Garrity [Chs. 11-15]
Stanley Blystone
Rankin [Chs. 11-15]
George Chesebro
Dent [Chs. 11-15]
Stanley Price
Chief John W. Malloy (as Montague Shaw)
C. Montague Shaw
Director
James W. Horne
Screenplay
Wyndham Gittens
Basil Dickey
George H. Plympton