"The Plot Master"

 "This ends your game. Your plots are finished."

                                                                    -The Shadow

A fun concept for the cover, just not a great illustration.  The master of disguise observing another disguise artist.  At least the story is top shelf.  As a bit of trivia this adventure included Professor Arthur Whitburn for the final time.  He first appeared in 'The Red Menace' back in 1931.