Character Name : Jack Holt / Nick Farrell

Original Name : Jack Holt

Gender : Male

Character Name : Kay Drew

Original Name : Evelyn Brent

Gender : Female

Character Name : 'Lucky' Arnold

Original Name : John Ward

Gender : Male

Character Name : Quist

Original Name : Ted Adams

Gender : Male

Character Name : 'Crimp' Evans [Chs. 1, 4-15]

Original Name : Joe McGuinn

Gender : Male

Character Name : Ed Valdin [Chs. 1-10]

Original Name : Tris Coffin

Gender : Male

Character Name : Garrity [Chs. 11-15]

Original Name : Stanley Blystone

Gender : Male

Character Name : Rankin [Chs. 11-15]

Original Name : George Chesebro

Gender : Male

Character Name : Dent [Chs. 11-15]

Original Name : Stanley Price

Gender : Male

Character Name : Chief John W. Malloy (as Montague Shaw)

Original Name : C. Montague Shaw

Gender : Male

Character Name : Agent Jim Layton

Original Name : Edward Hearn

Gender : Male

Character Name : Agent Frank [Chs. 3-5, 8-9, 15]

Original Name : Jack Cheatham

Gender : Male

Character Name : John Severn - Engraver [Chs. 1-4]

Original Name : Ray Parsons

Gender : Male