Behind the Mask

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

A federal agent goes undercover to infiltrate a drug smuggling operation headed by a mysterious Mr. X, 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.