Outside the open door stood the sentry, holding his rifle, with fixed bayonet, in the attitude of a sportsman who expects a covey of partridges to rise from the stubble. A window of plain glass gave on to the platform. Seemingly, it had not been opened since the station was built. Three windows of frosted glass in the opposite wall were, to all appearance, practicable. Judging by the sounds, the station square lay without. Was there a lock and key on the door? Or a bolt? He could not tell from his present position. The sentry had orders to kill him if he moved. Perhaps the man would not interpret the command literally. At any rate, that was a risk he must take. With head sunk, and hands behind his back, obviously in a state of deep dejection, he began to stroll to and fro. Well, he had a fighting chance. He was not shot forthwith. A slight commotion on the platform caught his eye, the sentry's as well. A tall young officer, wearing a silver helmet, and accompanied by a glittering staff, clanked past; with him the lieutenant of reserves, gesticulating. Dalroy recognised one of the Emperor's sons; but the sentry had probably never seen the princeling before, and was agape. And there was not only a key but a bolt! With three noiseless strides, Dalroy was at the door and had slammed it. The key turned easily, and the bolt shot home. Then he raced to the middle window, unfastened the hasp, and raised the lower sash. He counted on the thick-headed sentry wasting some precious seconds in trying to force the door, and he was right. As it happened, before the man thought of looking in through the platform window Dalroy had not only lowered the other window behind him but dropped from the sill to the pavement between the wall and a covered van which stood there. Now he was free--free as any Briton could be deemed free in Aix-la-Chapelle at that hour, one man among three army corps, an unarmed Englishman among a bitterly hostile population which recked naught of France or Belgium or Russia, but hated England already with an almost maniacal malevolence. And Irene Beresford, that sweet-voiced, sweet-faced English girl, was a prisoner at the mercy of a "big blonde brute," a half-drunken, wholly enraged Prussian Junker. The thought rankled and stung. It was not to be borne. For the first time that night Dalroy knew what fear was, and in a girl's behalf, not in his own. Could he save her? Heaven had befriended him thus far; would a kindly Providence clear his brain and nerve his spirit to achieve an almost impossible rescue? The prayer was formless and unspoken, yet it was answered. He had barely gathered his wits after that long drop of nearly twelve feet into the station yard before he was given a vague glimpse of a means of delivering the girl from her immediate peril. CHAPTER II IN THE VORTEX