Contained in the book .
While following a suspicious car through East Anglia, Ray Raymond and his friend Jacox are certain they are onto a spy operation. They latch on to two men they are certain are casing the region in preparation for an invasion. Their subsequent discovery of German spy Erna Stolberg will lead them to a safe house and detailed plans for the hiding of arms and supplies for that invasion. Raymond uses a small explosive device to destroy the enemies' work.