I WAR IS DECLARED II THE SECRET SERVICE AT WORK III BOB HAS A FIGHT IV HEINRICH AND PERCY V ON THE BRIDGE VI HUGH HAS AN IDEA VII IN THE NIGHT VIII A STRANGE OCCURRENCE IX ANOTHER SURPRISE X BOB IS MYSTIFIED XI THE DESERTED HOUSE XII TRAPPED XIII MISTAKEN IDENTITY XIV AN EXPEDITION XV FIRE XVI MORE COMPLICATIONS XVII A MESSAGE XVIII KARL HOFFMANN XIX A DISCUSSION XX ANOTHER SUSPECT XXI ON THE STREET XXII BOB ACTS QUICKLY XXIII UNDER THE LIGHT XXIV AT THE FACTORY XXV A STRUGGLE IN THE DARK XXVI AN EXPEDITION IS PLANNED XXVII A RAID AND A SURPRISE XXVIII CONCLUSION