Casts
Jack Holt
as Jack Hart aka Quinn
Constance Cummings
as Julie Arnold
Boris Karloff
as Jim Henderson
Claude King
as Arnold
Edward Van Sloan
as Dr. August Steiner / Dr. Alec Munsell / Mr. X
Willard Robertson
as Capt. E.J. Hawkes
Thomas E. Jackson
as Agent Burke
Martha Mattox
as Hotel Ansonia Maid
Jessie Arnold
as Eastland Hospital Nurse
Harry Tenbrook
as Man in Black / Henchman in Boat
