By Arthur B. Reeve
I. The Silent Bullet
II. The Scientific Cracksman
III. The Bacteriological Detective
IV. The Deadly Tube
V. The Seismograph Adventure
VI. The Diamond Maker
VII. The Azure Ring
VIII. "Spontaneous Combustion"
IX. The Terror In The Air
X. The Black Hand
XI. The Artificial Paradise
XII. The Steel Door
