The Phantom has learned the identity of Mr. X. What are you writing?
adventure; jungle; superhero
From Phantom daily strips (King Features Syndicate) 1937-12-20 - 1937-12-25, 1937-12-27 - 1938-01-01 & 1938-01-03 - 1938-01-06. [One panel is omitted from one of the dailies on each page, in order to fit two 4-panel strips onto each 7-panel page.]