He called an order, quite calmly over his shoulder. I suppose, at that moment, the Earth war vessels were no more than five miles away. The whole sky was a kaleidoscope of darting lights. In answer to his order, from the peak of our tower a light bomb mounted—a vertical ray of green light. The bomb of surrender!

Tarrano chuckled. "That should halt them. Come! We must start."

He held a brief colloquy with a Venus man who appeared beside him. The man nodded and hastened back into the instrument room. The green light of our bomb had died away. The lights in the sky began fading—the whole sky fading, turning to blackness! I became aware that Tarrano had thrown around our tower a temporary isolation barrage. For a few moments—while the current he had at his command could hold it—we could not be seen on the image finders of the advancing vessels.

Tarrano repeated: "That should hold them—I have surrendered! They should be triumphant. And outside our barrage, our men will bargain with them. Ten minutes! We should be able to hold them off that long at least. Come, Lady Elza. We must start now."

With a scant ceremony in sharp contrast to his courteous words to Elza, he hurried us off. Three of us—Elza, Wolfgar and myself, with one attendant who still carried Elza's personal belongings. Hurried us into the vertical car which had brought us up into the tower. It descended now, down the iron skeleton shaft. Outside the girders I could see only the blackness of the barrage, with faint snapping sparks.

Silently we descended. It seemed very far down. And suddenly I realized that we were going lower than the ground level. The barrage sparks had vanished. The blackness now was a normal darkness; and in it I could see slipping upward the smooth black sides of the vertical shaft into which we were dropping. And the sulphuric smell of the barrage was gone. The air now smelt of earth—the heavy, close air of underground.

I do not know how far down we went. A thousand feet perhaps. The thing surprised me. Yet in those moments my mind encompassed it; and many of Tarrano's motives which I had not reasoned out before now seemed plain. He had come from Venus to the Earth, possibly several months ago. Had come directly here to Venia and set up his headquarters. His purpose on Earth—as he had just told me—did not lie with warfare. While he was here his forces had conquered the Great City of Venus, and just now, the Hill City of Mars. He controlled Venus and Mars—but he was still far from ready to attack the Earth.

He had come to the Earth in person for several important purposes. For one—he desired the Brende model and Dr. Brende's notes. He had them now; they were, in reality, at this present moment in the Great City of Venus. Also, with the Brende secret—to control it absolutely—he had to have Georg Brende. Well, as I was soon to realize, Georg was now his captive. And the Princess Maida? His purpose in holding her was two-fold. She had, now as always in the Venus Central State, a tremendous sentimental sway upon her people. Tarrano had abducted her, forcibly to remove her from the scene of action, so that during her unexplained absence his propaganda would have more influence. He had brought her here to Earth; and now his plan was to have Georg Brende and her fall in love with each other. He still hoped to win Georg to his cause, by giving him the Princess Maida, if for no other reason. And with Maida married to Georg—and Georg in Tarrano's service—Maida herself would turn her influence in Venus to consolidate her people to Tarrano.

These, in part, were Tarrano's present plans and motives. They were working out well. And—as he had said—the Earth did not concern him now as a battle-ground. Later ... But even with this sudden insight which seemed to come to me, I was inadequate to grasp what later he was to attempt.

While thus occupied with my thoughts, we were steadily descending into the ground under Venia—dropping out of sight while above us, perhaps by now, the eager warcraft of Earth were overwhelming the city. Tarrano had not spoken; but when at last our little car bumped gently at the bottom, he said smilingly: "We are here, Lady Elza."