| Inspector Thomas J. Tunney | [Frontispiece] |
| | PAGE |
| Lieutenant-Colonel Nicholas Biddle, Military Intelligence | [4] |
| Paul Koenig | [10] |
| Random Pages from “P. K.’s Little Black Book” | [22], [23], [26], [27], [36], [37] |
| Alexander Dietrichens and Frederick Schleindl | [30] |
| Carmine and Carbone in Court | [46] |
| Pages from the bomb-thrower’s textbook | [52] |
| A postcard received by Commissioner Woods after the arrest of the Anarchists | [60] |
| Detectives in Disguise—George D. Barnitz, Patrick Walsh, James Sterett, Jerome Murphy | [64] |
| Threats to Polignani | [66] |
| Frank Abarno and Carmine Carbone | [66] |
| A Handbill, printed in Hindu, used by the Hindu-Boche Conspirators | [72] |
| The Hindu-Boche Conspirators | [76] |
| The Annie Larsen’s Cash Account | [80] |
| Gupta’s Code Message | [80] |
| How the Hindus used Price Collier’s “Germany and the Germans” as a cryptogram | [90] |
| Alexander V. Kircheisen and his application for a certificate as able seaman | [106] |
| Lieutenant George D. Barnitz, U. S. N. | [118] |
| Robert Fay and Lieut. George D. Barnitz | [130] |
| Fay, Daeche and Scholz arraigned in Court | [130] |
| The Fay Bomb Materials | [138] |
| Lieutenant Fay’s Motor Boat | [150] |
| Rudder Bombs | [154] |
| Franz Rintelen | [160] |
| Henry Barth, who posed as the German Secret Service Agent | [164] |
| Ernest Becker | [168] |
| Captain Charles von Kleist and Captain Otto Wolpert | [168] |
| Sergeant Thomas Jenkins, U. S. Army, who located part of one of the bombs in the German Turn Verein in Brooklyn | [174] |
| Norman H. White, of Boston, a civilian attached to the Military Intelligence, who unearthed numerous German intrigues | [180] |
| Mrs. Holt’s Mysterious Letter | [208] |
| The First Word from Texas | [208] |
| Fritz Duquesne prepared for a Lecture Tour as Captain Claude Stoughton | [224] |
| From Fritz Duquesne’s Past | [230] |
| Papers found in Fritz Duquesne’s effects | [236] |
| Lieutenant Commander Spencer Eddy | [248] |
| Major Fuller Potter, Military Intelligence | [252] |
| Lieutenant A. R. Fish, Naval Intelligence | [260] |
| Captain John B. Trevor, Military Intelligence | [268] |