Chapter titles: 1. The Phosgene Bullet 2. The Vacuum Room 3. The Air Terror 4. The Dungeon 5. [unknown] 6. The Wireless Detective 7. The Neragraph 8. The Silent Shot 9. The Camera Trap 10. The Moonshiners 11. The White Damp 12. The X-Ray Detective 13. The Ruse 14. [unknown] 15. [unknown]