Cast
Dr. Constance Petersen
John Ballantyne
Dr. Alexander Brulov
Dr. Murchison
Mary Carmichael
Dr. Fleurot
Mr. Garmes
House Detective
Dr. Graff
Harry
Stranger in Hotel Lobby
Det. Lt. Cooley
Det. Sgt. Gillespie
Dr. Hanish
Matron, not listed in creditsа
Railway Gateman, not listed in credits
Ticket Taker, not listed in credits
Gateman, not listed in credits
John Ballantine as a Boy, not listed in credits
Nurse, not listed in creditsа
Dr. Anthony Edwardes, not listed in credits
Man Leaving Elevator, not listed in credits
John Ballantine's Brother, not listed in credits
Sheriff, not listed in creditsHallett - Railroad Clerk, not listed in credits 
Policeman at Train Station, not listed in creditsDr. Brulov's Housekeeper, not listed in creditsа 
Police Captain, not listed in credits
Dr. Galt, not listed in creditsNorma Cramer, not listed in creditsа Secretary at Police Station, not listed in credits 
Bellboy, not listed in credits
