Grantline laughed, "I hope you won't!" A warning call took us back to the front window. The brigand's search-beam was again being used. It swept slowly along the length of the cliff. Its circle went down the cliff steps to the valley floor, and came sweeping up again. Then it went up to the observatory platform at the summit above us, then back and crept over to the ore-sheds. We had no men outside, if that was what the brigand wanted to determine. The search-beam presently vanished. It was replaced immediately by a zed-ray, which darted at once to our treasure sheds and clung. That stung Grantline into his first action. We flung our own zed-ray down across the valley. It reached the brigand ship; this zed-ray and a search-light were our only two projectors of long range. The brigand ray vanished when ours flashed on. I was with Grantline at an image grid in the instrument room. We saw the deck of the brigand ship and the blurred interior of the cabins. "Try the search-beam, Franck. We don't need the other." The zed-ray went off. We gazed down our search-light which clung to the dome of the distant enemy vessel. We could see movement there. "The telescope," Grantline ordered. * * * * * The little dynamos hummed. The telescope-finder glowed and clarified. On the deck of the ship we saw the brigands working with the assembling of ore-carts. A deck landing-porte was open. The ore-carts were being carried out through a porte-lock and down a landing incline. And on the rocks outside, we saw several of the carts--and rail-sections and the sections of an ore-shute. Miko was unloading his mining apparatus! He was making ready to come up for the treasure! The discovery, startling as it was, nevertheless was far overshadowed by an imperative danger alarm from our main building. Brigands were outside on our ledge! Miko's search-beam, sweeping the ledge a moment before, had carefully avoided revealing them. It had been done just for that purpose, no doubt--making us sure that the ledge was unoccupied and thus to guard against our own light making a search. But there was a brigand group here close outside our walls! By the merest chance the radiating glow from our search-ray had shown the helmeted figures scurrying for shelter. Grantline leaped to his feet. We rushed for the rear exit-porte which was nearest us. The giant bloated figures had been seen running along the outside of the connecting corridor, in this direction. But before we ever got there, a new alarm came. A brigand was crouching at a front corner of the main building! His hydrogen heat-torch had already opened a rift in the wall! CHAPTER XXXV _Desperate Offensive_ "In with you!" ordered Grantline. "Get your helmets on! How many? Six? Enough--get back there, Williams--you were last. The lock won't hold any more."