Grant Richards ( Grant Richards )

Philo Vance

Roscoe Karns ( Roscoe Karns )

Sergeant Heath

Helen Burgess ( Helen Burgess )

Ada Greene

Ruth Coleman ( Ruth Coleman )

Sibella Greene

Elizabeth Patterson ( Elizabeth Patterson )

Mrs. Tobias Greene

June Martel ( June Martel )

Barton

Ellen Drew ( Ellen Drew )

Secretary

Purnell Pratt ( Purnell Pratt )

John F. X. Markham

Colin Tapley ( Colin Tapley )

Chester Greene

James Bush ( James Bush )

Rex Greene

Leonard Carey ( Leonard Carey )

Lister

Nora Cecil ( Nora Cecil )

Harvey Stephens ( Harvey Stephens )

Ivan F. Simpson ( Ivan F. Simpson )

Greta Meyer ( Greta Meyer )

Myra Marsh ( Myra Marsh )

Barlowe Borland ( Barlowe Borland )