On Secret Service: The Secret Explosive

Published in Hearst's Magazine, Sep 1915. Collected as chapters 10-11 in the book The Door of Dread
Kestner reveals that they need to apprehend a man named David Strasser, who has developed a new explosive that poses a significant threat. He explains the technical details of Strasser's invention, highlighting its potential to revolutionize naval warfare. Sadie, while initially indifferent, begins to understand the gravity of the situation and the urgency of their mission.