weaknesses," said Kane in his ear. "When the whole field of vision is suddenly illuminated, the brain may register an invisible object, especially if it's moving, for a moment before it melts into the background." Something whimpered in the air and burst with an ear-splitting bang only a few yards away, showering the raiders with earth. "They've got our position. Get going—now!" as the lights flashed on. They rose and charged toward the space ship. Kane's fingers had been busy fusing a bomb, and as he rose erect he threw it straight into the cordon. The crash of the explosion was followed by shrieks and then, as the lights flashed on again, by a prolonged volley of shots. Larrabie sprung around in midstride and rolled on the ground. The long-legged Clark flung out his arm and pitched forward. "Get the—" His voice choked off. The survivors charged at the gap where the bomb had wrought bloody havoc. The Germans were closing it from the sides. Manning caught a glimpse of sweating faces, staring eyes glazed with fear of an enemy they could not see; and he saw also the vast loom of the space ship above him. He fumbled woodenly with a detonator cartridge. Kane's fingers bit into his arm. "Into the ship!" he rasped. "You'd never dent it." Nothing was between the invaders and the hull, where an open airlock, high overhead, showed as a black disc. Manning glanced over his shoulder, and in the nightmarishly flashing illumination saw Larrabie's body sprawled in a frozen convulsion, and standing over it, head thrown back, a huge hound. A black mass of yelling men was closing in.... Then the four of them were clambering up the ladder that rose dizzily to the space ship's lock forty feet above ground. Every flash of the light silhouetted them so nakedly against the great hull that it seemed impossible they should not be seen and picked off as they clung helplessly. But Manning saw Dugan above him, disappear into the lock; he heaved himself up and stumbled into the saving blackness, followed by a panting bulk that must be Vzryvov. Kane's voice came, surprisingly steady, from deeper in the tunnel-like lock, where as their eyes adjusted a faint glow was evident, seeping no doubt from a passage beyond. "This was the main loading lock, and I guess still is. They've apparently torn out all the freight decks and replaced them with a lead-lined tank for the dust bin and they've been loading it through