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| I | The Alsatian Smuggler who helped Napoleon to capture the Austrian Army | [3] |
| II | Belle Boyd, the Confederate Girl who saved Stonewall Jackson | [21] |
| III | The Indian Scout who was the Hero of King Philip’s War | [35] |
| IV | How the Suicide of a Staff Officer Once Averted War between Austria and Russia | [51] |
| V | The Romantic Side of Major André’s Unsuccessful Exploit | [63] |
| VI | The Strange Adventures of the Chevalier D’Eon at the Russian Court | [79] |
| VII | How Napoleon’s Chief Spy Hoodwinked the Emperor of Austria | [95] |
| VIII | Lydia Darrah, the brave Quakeress who saved Washington’s Army from Destruction | [111] |
| IX | Doctor Steiber and the Mystery of the Franco-Prussian War | [129] |
| X | The Adventure of Private Morgan in the camp of Cornwallis | [145] |
| XI | The Mysterious and Romantic Case of General Napper Tandy | [159] |
| XII | How Monsieur de Meinau helped to make Jerome Bonaparte King of Westphalia | [175] |
| XIII | The Strange Mystery Surrounding the Betrayal of Captain Nathan Hale | [189] |
| XIV | Major Le Caron and the Fenian Invasion of Canada | [205] |
| XV | How Emma Edmonds Penetrated the Confederate Lines | [223] |
| XVI | The Amazing Adventure of Brigadier-General Lafayette C. Baker | [243] |
| XVII | The Mysterious “F” and the Captured Troopers | [273] |
| XVIII | The Mysterious Man who asked for a Light | [293] |
| XIX | Carl Lody and Spies of the World’s Greatest War | [309] |