CHAPTER TITLES: 1. The Mystery of the Blooming Gardenias; 2. Death in the Laboratory; 3. Cleared Mysteries; 4. Mystery of the Black Fox; 5. Death in the River; 6. The Criminal Shadow; 7. Face To Face; 8. The Fatal Trap; 9. Parisian House Tops; 10.Battle Royal; 11.The Burning Fuse; 12.The Roofs of Limehouse; 13.The Sting of the Scorpion; 14.The Scorpion Unmasked; 15.The Trap is Sprung.
During filming of an action scene, a bullet ricocheted and struck director Robert F. Hill in the head. The injuries he incurred caused him to retire from active directing three years later.