With a grim, set face Tristan closed the top of the cabinet and replaced it on the rocky ledge. Thus he stood, his face buried in his hands. Could the All-seeing God permit such an outrage and let the perpetrators live? But there was no time for reflection. At any moment one of the muffled phantoms might return, and indeed he thought he heard steps approaching through one of the rock galleries. He crouched in breathless, agonized suspense, for it did not suffer him longer in these caverns of crime and death. He dimly remembered the direction in which the nocturnal company had departed and, after some research, he discovered a narrow corridor that seemed to slope upward through the gloom. His lantern having been broken to atoms, the taper held out little promise of life beyond a brief space of time during which he must find the entrance of the cavern, if he did not wish to meet a fate even worse than death in the event of discovery. Grimly resolved Tristan raised the flickering taper and entered the gallery on his left. The Stygian gloom almost extinguished the feeble light, though he noted every object he passed, every turn in the tortuous ascent. After some time which seemed eternity he at last perceived a dim glow at the extremity of the gallery, and soon found himself before the outer cavity of the stone wall, in a region of the city that seemed miles removed from the place where he had entered. It was near daybreak. The moon shone faintly in the grey heavens and a vaporous mist was sinking from shapeless clouds that hovered over the course of the Tiber. Tristan looked about his solitary lurking place, but beheld no human being in its lonely recesses. Then his eyes fixed themselves with a shudder upon the glooming vault from which he had made his escape. He was on the track of a terrible mystery, a mystery which shunned the light of day and of heaven. He must fathom it, whatever the risk. A strange new energy possessed him. His life at last seemed to have a purpose. He was no longer a rolling stone. There was work ahead. His future course stood out clearly defined, as Tristan turned his back upon the Catacombs of St. Calixtus and took the direction of the Aventine. To Odo, the Monk of Cluny, he must confide the terrible discovery he had made in the mephitic caverns of the Catacombs. To him he must turn for counsel, of which he stood sorely in need. And in some way which he could not account for to himself, Tristan felt as if the fate of Hellayne was bound up in these dreadful mysteries. At first the thought seemed absurd, but somehow it gained upon him and began to add new weight to his burden. Could he but see her! Could he but have speech with her. A great dread seized him at the thought of what might be her fate at the present hour. What would she think of him who seemed to have abandoned her in the hour of dire distress, when she needed him above all men on earth?