They couldn't knock him out, so they tried to tear him down.
SCIENCE TRAPS A KILLER!
«MUST CONFESS. HONORABLE SON...This Is My Most Baffling Case!»
The screen's most daring sleuth!
Charlie Chan at his best in his most thrilling adventure!
There's TERROR In Every Clue!
It's The HEIGHT of FRIGHT! (original poster)
THE MASTER OF MYSTERY EXPOSES A GENIUS OF CRIME! (original print ad - all caps)
THE MYSTERY OF THE ALPHABET MURDER CASE! (original ad - all caps)
Death lurks at every step...as your oriental super-sleuth stalks a desperate killer -- below the surface of the earth!
Death rides the clouds
THE RIDDLE OF THE "KNIVES OF DEATH!" (original print ad - all caps)