Opportunity came at that moment. A crack of light appeared along the passage. A door was opening there. A moment later a head and shoulders showed. Someone was climbing up. Swiftly the officer ran to the place. The pirate did not even suspect anything wrong until he felt the spots of milky light on his face. He showed his terror plainly. "Get up!" Quirl hissed. The man obeyed with alacrity. Quirl glanced down. He saw tiers of bunks, evidently one of the crew's dormitories. He now turned to the cowering pirate. "I'd as soon kill you as not!" Quirl snarled. "You got me wrong, brother!" the pirate whined. "I'm with Gore in this deal. Lay off!" "Where you bound for?" "I have to relieve Burke at the ventilating turbines." "Let Burke wait. Lead on to the invisibility generators." "Oh, I can't do that, mister! I got to have a pass. Say, mister, I was just kidding about being one of Gore's men. I'm for the cap'n, yes, sir!" "You lying scum!" Quirl barked impatiently. "Get going!" The white-faced and bewildered pirate led the way down the tube to the after end. He unlatched a door and tried to enter, but as soon as he had dropped through to the platform he was met by a guard with leveled ionizer. "This gem'man," he started to explain. But Quirl dropped after him and gave him a powerful shove, so that he crashed into the guard. The latter pulled the trigger, and the unfortunate pirate crashed over the platform's edge to the floor. Quirl had out his own electrogun and dispatched the guard. At the same time he felt a stunning shock. His senses reeled, but the grating had taken part of the discharge loosed by a pirate electrician at the foot of the ladder. Quirl threw his riot club and followed that up with another lightning bolt. * * * * * He was then the only living person in the room, in which two generators hummed softly. Connected to them was a bank of U-shaped tubes, each as tall as a man, which were filled with silent livid fire. Quirl picked up a wrench and started hammering at the thick tubes until the glass cracked. Each time he was engulfed by a wave of heat, and the tube became black. The great generators idled and automatically came to a stop. Quirl was certain now that the pirate ship would be visible, but the position of the captives was still desperate. He hoped that none of the surviving pirates would think of calling at the generator room, or find out in some other way that they were now visible in the eternal day of space. Quietly he climbed back to the passage and closed the hatch. He cast about for his next move. He was looking toward the bow, but on hearing the subdued clink of metal on metal, he turned. A dozen of the pirates were coming toward him. It would have been useless to draw his weapon. Theirs were out and could have burned him to a crisp before he could move. Silently and with deadliness apparent in every move they approached him.