Behind the Mask is a 1932 American pre-Code horror film directed by John Francis Dillon and starring Jack Holt, Boris Karloff and Edward Van Sloan.
[1][2] A federal agent (Holt) goes undercover to infiltrate a drug smuggling operation headed by a mysterious Mr. X (Van Sloan), a criminal mastermind whose identity is unknown even to his henchmen.
Mr. X is also running a bogus hospital where victims are killed on the operating table, and their coffins stuffed with narcotics.
The drug-filled coffins are then buried in a cemetery.
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