The Steel Door

The Black Hand

The Forger

The Azure Ring

The Confidence King

The Germ of Death

The Sand-Hog

The Terror in the Air

Artificial Paradise

The Invisible Ray

The Yeggman

The Campaign Grafter

The Seismograph Adventure

The Silent Bullet

The Deadly Tube

The Bacteriological Detective

The Smuggler

The White Slave

The Unofficial Spy

The Firebug