- Edward Raquello - Eduardo Grassi
- Creighton Hale - Du Bois - Fingerprint Man
- Harry Strang - Hennessey - Markham's Assistant
- Richard Kipling - Archer Coe
- Wedgwood Nowell - Brisbane Coe
- Herbert Anderson - First Reporter (uncredited)
- Henry Blair - Hans Snauble (uncredited)
- Egon Brecher - Austrian Judge (uncredited)
- Harry Burns - Capt. Lugo (uncredited)
- Yakima Canutt - Sorrento Sailor (uncredited)
- Nat Carr - 2nd Photographer (uncredited)
- Glen Cavender - Train Porter Asked to Send Telegram (uncredited)
- Loia Cheaney - Markham's Secretary (uncredited)
- Frederick Giermann - Austrian Sergeant (uncredited)
- Eddie Graham - Coroner's Assistant (uncredited)
- John Harron - Third Reporter (uncredited)
- Stuart Holmes - Hertz (uncredited)
- William Hopper - Clerk at Hotel Nino in Chicago (uncredited)
- Olaf Hytten - Charles (uncredited)
- George Irving - Avery (uncredited)
- Marion Lessing - Mrs. Fritz Snauble (uncredited)
- Frank Mayo - Doorman (uncredited)
- George Reeves - Steamship Clerk (uncredited)
- John J. Richardson - 4h Reporter (uncredited)
- Cliff Saum - Investigator Snitken (uncredited)
- Hans Schumm - Nazi Officer at Dock (uncredited)
- Frank Wilcox - 2nd Reporter (uncredited)
- Jack Wise - 1st Photographer (uncredited)
- Maris Wrixon - Long-Distance Operator (uncredited)
- Henry Zynda - Austrian Lieutenant (uncredited)
-
William Clemens
- Tom Reed
James Stephenson hace el papel de Philo Vance.
Margot Stevenson interpreta a Hilda Lake en la película.
Henry O'Neill interpreta a Markham en la película.
Edward Brophy interpreta a Ryan en la película.
Sheila Bromley hace el papel de Doris Delafield.
Ralph Forbes hace el papel de Tom McDonald.
Donald Douglas interpreta a Philip Wrede en la película.
Martin Kosleck interpreta a Gamble en la película.
Jimmy Conlin interpreta a Dr. Doremus - Coroner en la película.
Edward Raquello interpreta a Eduardo Grassi en la película.
Creighton Hale interpreta a Du Bois - Fingerprint Man en la película.
Harry Strang interpreta a Hennessey - Markham's Assistant en la película.
Richard Kipling hace el papel de Archer Coe.
Wedgwood Nowell interpreta a Brisbane Coe en la película.
Terry interpreta a MacTavish (uncredited) en la película.
Herbert Anderson hace el papel de First Reporter (uncredited).
Henry Blair interpreta a Hans Snauble (uncredited) en la película.
Egon Brecher interpreta a Austrian Judge (uncredited) en la película.
Harry Burns hace el papel de Capt. Lugo (uncredited).
Yakima Canutt interpreta a Sorrento Sailor (uncredited) en la película.
Nat Carr interpreta a 2nd Photographer (uncredited) en la película.
Glen Cavender interpreta a Train Porter Asked to Send Telegram (uncredited) en la película.
Loia Cheaney hace el papel de Markham's Secretary (uncredited).
Frederick Giermann hace el papel de Austrian Sergeant (uncredited).
Eddie Graham interpreta a Coroner's Assistant (uncredited) en la película.
John Harron hace el papel de Third Reporter (uncredited).
Stuart Holmes hace el papel de Hertz (uncredited).
William Hopper hace el papel de Clerk at Hotel Nino in Chicago (uncredited).
Olaf Hytten interpreta a Charles (uncredited) en la película.
George Irving hace el papel de Avery (uncredited).
Marion Lessing hace el papel de Mrs. Fritz Snauble (uncredited).
Rolf Lindau interpreta a Aeronautics Department Sentry (uncredited) en la película.
Frank Mayo interpreta a Doorman (uncredited) en la película.
George Reeves interpreta a Steamship Clerk (uncredited) en la película.
John J. Richardson interpreta a 4h Reporter (uncredited) en la película.
Cliff Saum hace el papel de Investigator Snitken (uncredited).
Hans Schumm hace el papel de Nazi Officer at Dock (uncredited).
Frank Wilcox interpreta a 2nd Reporter (uncredited) en la película.
Jack Wise hace el papel de 1st Photographer (uncredited).
Maris Wrixon interpreta a Long-Distance Operator (uncredited) en la película.
Henry Zynda interpreta a Austrian Lieutenant (uncredited) en la película.
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