At the entrance they halted, and peered in. Ranged along the wall to the right stood the horses, which, scenting strangers, moved restlessly. In the left corner the rays of a lamp fell through an open trap-door above, lighting a rough wooden staircase. From the upper room came the sound of voices mingled with snores. At the uneasy movements of the horses the conversation ceased for a moment. A head appeared at the edge of the trap-door, and a rough voice ordered the animals to be quiet, as one might tell a dog to "lie down." Another voice from behind sleepily asked a question. The first man replied, and withdrew from the opening. Then the low-toned conversation was resumed. There being but one entrance to the tower, and but one gateway in the wall, the single sentry whom Milosh had disposed of had no doubt been considered a sufficient guard; but old Marco had decided, leaving nothing to chance, to post his grandson at the doorway, to keep watch outside and give the alarm if any sudden interference should threaten. The boy grasped manfully the revolver given him, and stood against the wall out of the ray of light. The others slipped silently across the room to the staircase. At its foot they halted a moment, looking up towards the trap-door. The staircase was clearly a rickety affair. Some of the treads were missing; the handrail and balusters which had formerly edged it on the outer side were now wholly removed. Signing to his companions to move carefully, Milosh began to ascend. At his first step there was an ominous creak, masked, however, by a renewed stir among the horses. The old Serb and Burton followed in turn, treading as lightly as they could. Milosh was half-way up when, stepping over a gap, his foot came down heavily on the stair above, and the timber emitted a loud groan. The voices above ceased; then a gruff voice in the Bulgarian tongue muttered: "What was that?" Milosh hurried his ascent. A shadow fell on the men below him; something had moved at the edge of the trap-door. A cry of alarm ended in an inarticulate gasp; for the second time that night a Serbian knife had taken toll of the national enemy. There was a loud shout from behind the fallen man, followed by confused cries from the awakened sleepers. Regardless now of any noise they might make the three men sprang up the remaining stairs. A shot rang out as Milosh flung himself into the room, with Marco close behind him, and when Burton stood upon the floor, he found himself in the thick of a furious _mêlée_ that gave him no time to take in the scene.