"Me. I cracked my skull on this confounded ceiling." He paused. "Joan, we must be on the same level as my cell." He got down on hands and knees, crawled along the passage, running his fingers across the stones. "Ah!" he said. His questing fingers had discovered a hole close to the floor. "Where are you?" Joan cried. "Here." She moved up cautiously until she bumped into him. "Whatever are you after, groveling on the floor?" she asked greatly relieved. "I've a hunch," he replied. "Wait here!" He wormed his way into the hole, found it blocked by the stone. Delicately, he ran his fingers over its surface seeking its mechanism. A catch? There it was. He released it, hauled. The stone slid towards him. Backing out of the hole, he drew the block after him. Joan stifled a scream as he bumped into her. With the block clear of the wall, he wriggled back into the hole. If possible the Stygian blackness was thicker than ever. There should be a cell on the other side of the wall. He lay still, listened. The silence was as absolute as the dark. He wormed his way ahead. With a shock he felt his fingers come in contact with bare flesh. A hand flicked across his face, clutched his throat with a grip of iron. Jaro wrenched backward, tried to call out, but that unrelenting grip on his throat held like a vise, choked off his words. His antagonist never uttered a sound. Silently, blindly they fought in the four foot square cell. Jaro got his hands on his antagonist's wrists, wrenched. His lungs were on fire, he thought wildly that no sensation was as agonizing as not being able to draw a breath. The man had succeeded in getting both hands on his throat. Jaro drew up his legs, kicked. His feet struck flesh, the iron fingers were torn from his throat. Blessed air poured into his lungs. Dimly, he realized that Joan was calling his name from the passage. Then she screamed. A man's voice beside him said: "Jaro! My God! Is that you, Jaro?" "Yes," panted Jaro, recognizing Landovitch, the T.I.S. agent. "I was looking for you. There's a hole here some place." His fingers were wildly running across the cold stones. "Joan's outside in the passage. Something's happened." Again the girl screamed. "Here it is," said Jaro with relief, dived through. Once clear of the walls, he stood up, cracked his head on the low ceiling. "Joan!" he said. He could hear Landovitch grunting and puffing, trying to squeeze his big frame through the narrow aperture. The girl did not answer. "Joan!" he called louder. His voice came back to him hollowly in the pitch black corridor. "Joan!" There was no answer. The girl was gone. VI Jaro hesitated undecided which way to go. "Pull me out of here," Landovitch pleaded. "I'm stuck." He felt around, seized the big T.I.S. agent's wrist, tugged. Landovitch came free, stood up, cracked his head against the roof with a thud. "It's a low ceiling," said Jaro. "This is a fine time to be telling me."