He thrust against the door at the top, and cursed soulfully to find that it did not give to his efforts. Then as he lifted his sword with his right hand to hew at the marble, his groping left encountered a metal bolt that evidently slipped into place at the closing of the door. In an instant he had drawn this bolt, and then the door gave to his shove. He bounded into the chamber like a slit-eyed, snarling incarnation of fury, ferociously desirous to come to grips with whatever enemy was hounding him. The dagger was…