Charlie Chan (Warner Oland) gets to watch a performance that's to die for. For seven years, opera star Gravelle (Boris Karloff) has been locked in an insane asylum, his identity a mystery - even to himself. But when his memory unexpectedly returns, he begins to recall that his wife and her lover tried to murder him - and now he's determined to make them face the music. Gravelle escapes from the asylum and makes his way to the San Marco opera house and begins hiding out in the various rooms and passageways. Soon, members of the opera company are being murdered one by one.
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