Behind the Mask
"A Slinking Fiend ... Sulking Terror ... Mad Murder!"
A Secret Service agent nabs a scalpel-happy doctor who runs drugs in caskets.
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Cast
Jack Holt
Jack Hart aka Quinn
Constance Cummings
Julie Arnold
Boris Karloff
Jim Henderson
Claude King
Arnold
Bertha Mann
Nurse Edwards
Edward Van Sloan
Dr. August Steiner / Dr. Alec Munsell / Mr. X
Willard Robertson
Capt. E.J. Hawkes
Thomas E. Jackson
Agent Burke
Martha Mattox
Hotel Ansonia Maid
Jessie Arnold
Eastland Hospital Nurse
