Adventures of an American Secret Service-girl in search of an important German secret during the war. Chapters: [1] “The Great Secret,”; [2] “Marked for Death,”; [3] “The Gas Chamber,”; [4] “Below the Waterline,”; [5] “The Acid Bath,”; [6] “The Unknown,”; [7] “The Betrayal,”; [8] “A Crippled Hand,”; [9] “Woes of Deceit,”; [10] “The Inn of Dread,”; [11] “The Death Studio,”; [12] “The Chance Trail,"; [13] “Wings of Mystery,”; [14] “The Hidden Way,”; [15] “The Secret Host"
Pearl White
Walter McGrail
George B. Seitz
Harry Semels
Wallace McCutcheon Jr.
Henry G. Sell
Marjorie Milton
Francis Wightwick
The Wolf Dog
Perils of the Royal Mounted
The King of the Kongo
The Phantom Rider
Bertha the Sewing Machine Girl
The Spider Returns
King of the Mounties
Mandrake the Magician
Canadian Mounties vs. Atomic Invaders
Dangers of the Canadian Mounted
Federal Agents vs. Underworld, Inc.
Government Agents vs Phantom Legion
King of the Circus
Perils of Nyoka
The Secret Code
Radar Patrol vs. Spy King
The Black Widow
The Lightning Raider
The Lost Express
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