"Jacaro!" snarled Tommy. He leaped instinctively to pursue. But the flying thing was bound for a landing in an open square, the same one which not long since had seen the heaviest fighting. It alighted there and toppled askew on contact. Figures tumbled out of it, in torn and ragged garments fashioned in the style of the very best tailors of the Earth's underworld. Men of Yugna raced to intercept them. Firearms spat and bellowed luridly. In a close-knit, flame-spitting group, the knot of men raced over fallen bodies and hurtled areas where the pavement had cooled to no more than a dull-red heat where a thermit shell had struck. One man, two, three men fell under the small-arms fire. The gangsters went racing on, firing desperately. They dived into a tunnel and disappeared. * * * * * "The Tube!" roared Smithers. "They' goin' for the Tube!" He plunged forward, and Tommy seized his arm. "They'll go through your Tube," he said curtly. "It looks like the one they came through. They'll think it is. Let 'em!" Smithers tried to tear free. "But they'll get back to Earth!" he raged. "They'll get off clear!" The sharp, cracking sound of a gun-cotton explosion came out of the doorway into which Jacaro and his men had dived. Tommy smiled very grimly indeed. "They've gone through," he said drily, "and they've blown up the Tube behind them. But--I didn't tell you--I took a look at your castings. Your pupils were putting them together, ready for the steam to go in, in place of the coils I used. But--er--Smithers! You'd discarded one pair of castings. They didn't satisfy you. Your pupils forgot that. They hooked them all together." Smithers gulped. "Instead of four right-angled bends," said Tommy grimly, "you have six connected together. You turned on the steam in a hurry, not noticing. And I don't know how many series of dimensions there are in this universe of ours. We know of two. There may be any number. But Jacaro and his men didn't go back to Earth. God only knows where they landed, or what it's like. Maybe somewhere a million miles in space. Nobody knows. The main thing is that Earth is safe now. The Death Mist has faded out of the picture." He turned and smiled warmly at Evelyn. He was a rather horrible sight just then, though he did not know it. He was bloody and burned and wounded. He ignored all matters but success, however. "I think," he said drily, "we have won the confidence of the Golden City, Evelyn, and that there'll be no more talk of gassing Earth. As soon as the Council meets again, we'll make sure. And then--well, I think we can devote a certain amount of time to our personal affairs. You are the first Earth-girl to be kissed in the Fifth Dimension. We'll have to see if you can't distinguish yourself further." * * * * *