"I know you! You're Spooner, and I've got you, you villain!" breathed the lad, writhing and twisting to get his right knee up where he could use it to advantage. Spooner, for it was the same man who had let the trap down under Steve on the tally-board platform, did not answer. He pressed the boy to him with a force that made the lad think his ribs were going to be crushed in. At the same time the man was trying to turn over and get Rush under him, where he would have quickly settled his young antagonist. All at once the Iron Boy jerked his knee up, planting it in the other's abdomen. Now the more Spooner hugged Rush, the harder did the knee press against him. With a mighty effort the rascal threw himself on his side. But in doing so he had relaxed his grip. Steve's right arm was jerked loose, and like a flash the Iron Boy delivered two short-arm jolts on the side of his opponent's jaw. The blows half stunned the big man. Steve struck him in the nose with a blow that was intended to reach the jaw and complete the work. At that instant there was a shout from down the level. Bob Jarvis came charging upon the scene. Steve recognized the voice of his companion. "I've got him, Bob!" shouted the lad with what little breath he had left. "I've got him down and out!" But Spooner was not quite "down and out" yet. He began fighting again in sheer desperation. His one thought now was to free himself from the grip of those young arms of steel. Bob grasped Spooner by the collar, and after a few violent tugs jerked the fellow free from Steve's embrace. Spooner staggered to his feet. Bang! Bob smote him a terrific blow on the jaw, and Spooner dropped in a heap. He was going to strike the man again when Steve stopped him. "Get a rope, quick! I'll take care of him. There's some rope over there by the pumps." Steve threw the prisoner over on his face, twisting the man's hands behind his back, and a few minutes later they had the fellow's hands securely tied behind his back. About that time the pump-man came running up. "Telephone to the superintendent that we have the man," commanded Steve. "Hurry, now! Don't stop to ask questions. Tell him we are bringing the fellow up in the skip." Spooner by this time had recovered sufficiently to walk with an Iron Boy on each side of him. In that formation they made their way to the skip. "None of your funny business now, unless you want another thump on the jaw," warned Jarvis threateningly. Mr. Penton had not arrived when they reached the surface, so they took their prisoner to the dry house, leaving word with the skip-tender to send Mr. Penton over there at once. The superintendent was not long in reaching the shaft, whence he hurried to the place indicated. "Mr. Penton, we have caught the guilty man," announced Steve. "There he is." "What--who is he?" demanded the official half unbelievingly, peering sharply at the prisoner.