James Stephenson
Philo Vance
Margot Stevenson
Hilda Lake
Henry O'Neill
Markham
Edward Brophy
Ryan
Sheila Bromley
Doris Delafield
Ralph Forbes
Tom McDonald
Donald Douglas
Philip Wrede
Martin Kosleck
Gamble
Jimmy Conlin
Dr. Doremus - Coroner
Edward Raquello
Eduardo Grassi
Creighton Hale
Du Bois - Fingerprint Man
Harry Strang
Hennessey - Markham's Assistant
Richard Kipling
Archer Coe
Wedgwood Nowell
Brisbane Coe
