Behind the Mask is a 1932 American pre-Code crime/horror film directed by John Francis Dillon and starring Jack Holt, Boris Karloff and Edward Van Sloan.

Plot

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.