The Mysterious Pilot

CHAPTER TITLES: 1) The Howl of the Wolf, 2) The Web Tangles, 3) Enemies of the Air, 4)In the Name of the Law, 5) The Crackup, 6) The Dark Hour, 7) Wings of Destiny, 8) Battle in the Sky, 9) The Great Flight, 10) Whirlpool of Death, 11) The Haunted Mill, 12) The Lost Trail, 13) The Net Tightens, 14) Vengeance Rides the Air, 15) Retribution.

End of chapter 9: Jim is hanging on a rope trying to save Jean. Last shot shows one plane above the other, but Jim is nowhere in sight.

Referenced in L. Ron Hubbard in His Own Voice: Trail of Discovery (2018)