Jack Holt / Nick Farrell
Kay Drew
'Lucky' Arnold
Quist
'Crimp' Evans [Chs. 1, 4-15]
Ed Valdin [Chs. 1-10]
Garrity [Chs. 11-15]
Rankin [Chs. 11-15]
Dent [Chs. 11-15]
Chief John W. Malloy (as Montague Shaw)
Agent Jim Layton
Agent Frank [Chs. 3-5, 8-9, 15]
John Severn - Engraver [Chs. 1-4]
