| Person | Type | Job | Role(s) |
|---|---|---|---|
 Ben G. Liss | Crew | Editing | Editor |
Charles Lang | Crew | Sound | Sound |
Howard Shoup | Crew | Costume & Make-Up | Costume Design |
L. William O'Connell | Crew | Camera | Director of Photography |
Louis Lindsay | Crew | Editing | Editor |
 S.S. Van Dine | Crew | Writing | Novel |
Ted Smith | Crew | Art | Art Direction |
Tom Reed | Crew | Writing | Screenplay |
 William Clemens | Crew | Directing | Director |
Cliff Saum | Cast | Actor | Investigator Snitken (uncredited) |
 Creighton Hale | Cast | Actor | Du Bois - Fingerprint Man |
 Donald Douglas | Cast | Actor | Philip Wrede |
Eddie Graham | Cast | Actor | Coroner's Assistant (uncredited) |
 Edward Brophy | Cast | Actor | Ryan |
 Edward Raquello | Cast | Actor | Eduardo Grassi |
 Egon Brecher | Cast | Actor | Austrian Judge (uncredited) |
 Frank Mayo | Cast | Actor | Doorman (uncredited) |
 Frank Wilcox | Cast | Actor | 2nd Reporter (uncredited) |
Frederick Giermann | Cast | Austrian Sergeant (uncredited) | |
 George Irving | Cast | Actor | Avery (uncredited) |
 George Reeves | Cast | Actor | Steamship Clerk (uncredited) |
 Glen Cavender | Cast | Actor | Train Porter Asked to Send Telegram (uncredited) |
 Hans Schumm | Cast | Actor | Nazi Officer at Dock (uncredited) |
 Harry Burns | Cast | Actor | Capt. Lugo (uncredited) |
 Harry Strang | Cast | Actor | Hennessey - Markham's Assistant |
Henry Blair | Cast | Hans Snauble (uncredited) | |
 Henry O'Neill | Cast | Actor | Markham |
Henry Zynda | Cast | Austrian Lieutenant (uncredited) | |
 Herbert Anderson | Cast | Actor | First Reporter (uncredited) |
Jack Wise | Cast | Actor | 1st Photographer (uncredited) |
 James Stephenson | Cast | Actor | Philo Vance |
 Jimmy Conlin | Cast | Actor | Dr. Doremus - Coroner |
 John Harron | Cast | Actor | Third Reporter (uncredited) |
 John J. Richardson | Cast | Actor | 4h Reporter (uncredited) |
Loia Cheaney | Cast | Markham's Secretary (uncredited) | |
 Margot Stevenson | Cast | Actress | Hilda Lake |
 Marion Lessing | Cast | Mrs. Fritz Snauble (uncredited) | |
 Maris Wrixon | Cast | Actress | Long-Distance Operator (uncredited) |
 Martin Kosleck | Cast | Actor | Gamble |
 Nat Carr | Cast | Actor | 2nd Photographer (uncredited) |
 Olaf Hytten | Cast | Actor | Charles (uncredited) |
 Ralph Forbes | Cast | Actor | Tom McDonald |
Richard Kipling | Cast | Archer Coe | |
Rolf Lindau | Cast | Actor | Aeronautics Department Sentry (uncredited) |
 Sheila Bromley | Cast | Actress | Doris Delafield |
 Stuart Holmes | Cast | Actor | Hertz (uncredited) |
 Wedgwood Nowell | Cast | Actor | Brisbane Coe |
 William Hopper | Cast | Actor | Clerk at Hotel Nino in Chicago (uncredited) |
 Yakima Canutt | Cast | Actor | Sorrento Sailor (uncredited) |
 Terry | Cast | MacTavish (uncredited) | |
Bo Ling | Cast | Ling Toy | |
| Person | Type | Job | Role(s) |
