"Hay lures, or maneuvers, a Slav plane away from its fellows, and while you're down below entertaining the others, flies wing to wing with it. He touches the spring of his ladder and it shoots out, powerfully magnetized, and clamps onto the steel fuselage of the Slav. The automatic control keeps Hay's scout steady, and the ladder is so highly attractive that the Slav simply can't get away. Hay crosses the gulf, taking with him the cord which controls the electro-magnet. He forces his way into the Slav, shoots down its pilot, releases the pull of the magnet, and--there you are! Our best pilot in possession of a Slav plane, and clad in a Slav officer's uniform! Do you get the idea now?" Lance strove for appropriate words. "Gee!" he spluttered. "It's--it's wonderful! And to think I tried to start a fight with Hay! I wish I'd known before. But I suppose," he added, "it was best to let not even me in on it, to keep it absolutely secret." "Exactly!" "And now what's Hay's mission?" Lance asked eagerly. * * * * * Colonel Douglas' face became sober. "A damnably dangerous one, and a mighty desperate one. As I said, the Torpedo Plan, which Hay is striving to carry out, seems to be America's last chance. We're holding the United Slavs, but only just. We simply can't break their line or make any headway against them; and when they do unleash their big push, there's nothing to stop them! So we're gambling everything on this slim hope. "American science," he continued, "has perfected a weapon which is called the 'flying torpedo.' It's a ghastly thing, too. Damn it, I actually feel sorry for the poor devils it bursts on! It's a sort of riposte to their disintegrating flame. "Picture a huge tanklike affair of steel, one hundred feet long. Picture a few dozen of them! Picture them crammed to overflowing with tons of glyco-scarzite, the most destructive explosive the mind of man has yet conceived. An explosive that can't be hurled in a shell and can't be dropped in a bomb from a plane. A pound or so of it, man, lays waste a square mile of anything! Even our scientists are a bit afraid of it. They've been trying to think up a way of unleashing it at the Slavs. And these flying torpedoes seem to be the answer. "The torpedoes are purely mechanical. Therefore, they can soar to any height whatsoever. Twenty, thirty, even forty miles. All right. Now, picture a dozen or so of these torpedoes soaring over the most important Slav bases and headquarters, thirty miles above the earth, at night, of course, and absolutely invisible to the most powerful search-rays. They fly without the slightest sounds. Get that? Well, when this squadron of awful death arrives at the exact point over the place to be demolished, the motive force switches off and down they crash. Imagine what will happen when they collide with the ground!" Douglas, with Lance's tense eyes on him, struck a clenched fist into an open palm.