Contents: Different Degrees of Spies; German Plans for Invading England; Jan Gootboom, My Native Spy; Secret Messages and How Carried; Spy Signs; Secret Plans of Fortresses; 'Butterfly Hunting" in Dalmatia; How Spies Disguise Th
Read More
Contents: Different Degrees of Spies; German Plans for Invading England; Jan Gootboom, My Native Spy; Secret Messages and How Carried; Spy Signs; Secret Plans of Fortresses; 'Butterfly Hunting" in Dalmatia; How Spies Disguise Th
Read Less