Behind the Mask

A Slinking Fiend ... Sulking Terror ... Mad Murder!

A Secret Service agent nabs a scalpel-happy doctor who runs drugs in caskets.

Cast

Jack Holt

Constance Cummings

Boris Karloff

Claude King

Bertha Mann

Edward Van Sloan

Willard Robertson

Thomas E. Jackson

Martha Mattox

Jessie Arnold

Harry Tenbrook