Philo Vance
John F.-X. Makkham – District Attorney of New York County.
Margaret Odell (The “Canary”) – Famous Broadway beauty and ex-Follies girl, who was mysteriously murdered in her apartment.
Amy Gibson – Margaret Odell’s maid.
Charles Cleaver – A man-about-town.
Kenneth Spotswoode – A manufacturer.
Louis Mannix – An importer.
Dr. Ambroise Lindquist – A fashionable neurologist.
Tony Skeel – A professional burglar.
William Elmer Jessup – Telephone operator.
Harry Spively – Telephone operator.
Alys La Fosse – A musical-comedy actress.
Wiley Allen – A gambler.
Potts – A street-cleaner.
Amos Feathergill – Assistant District Attorney.
William M. Moran – Commanding Officer of the Detective Bureau.
Ernest Heath – Sergeant of the Homicide Bureau.
Snitkin – Detective of the Homicide Bureau.
Guilfoyle – Detective of the Homicide Bureau.
Burke – Detective of the Homicide Bureau.
Tracy – Detective assigned to District Attorney’s office.
Deputy-Inspector Conrad Brenner – Burglar-tools expert.
Captain Dubois – Finger-print expert.
Detective Bellamy – Finger-print expert.
Peter Quackenbush – Official photographer.
Dr. Doremus – Medical Examiner.
Swacker – Secretary to the District Attorney.
Currie – Vance’s valet.