"I was really in your cell," Greg assured him. "I could have just thrown my image there, but I went there personally to get you. Russ Page, here, sent me out. When I gave him the signal, he brought both of us back." "I'm glad you're with us," Russ said. "Perhaps you'd like a cup of coffee, something to eat." Mallory stammered. "Why, I really would." He laughed. "Rations weren't too good in the prison ship." They sat down while Russ rang the galley for coffee and sandwiches. Crisply, Greg informed Mallory of the situation. "We want to start manufacturing these engines as soon as possible," he explained, "but I haven't even dared to patent them. Chambers would simply buy out the officials if I tried it on Earth, delay the patent for a few days and then send through papers copied from ours. You know what he'd do with it if he got the patent rights. He'd scrap it and the old accumulator business would go on as always. If I tried it on any other world, with any other government, he'd see that laws were passed to block us. He'd probably instruct the courts to rule against the manufacture of the engines on the grounds that they were dangerous." Mallory's face was grave. "There's only one answer," he said. "With the situation on the worlds, with this purge you told me about, there's only one thing to do. We have to act at once. Every minute we wait gives Stutsman just that much longer to tighten his hold." "And that answer?" asked Russ. "Revolution," said Mallory. "Simultaneous revolution in the Jovian confederacy, on Mars and Venus. Once free, the planets will stay free with your material energy engines. Spencer Chambers and his idea of Solar System domination will be too late." * * * * * Greg's forehead was wrinkled in thought, his facial muscles tensed. "First thing to do," he said, "is to contact all the men we can find ... men we can rely on to help us carry out our plans. We'll need more televisor machines, more teleport machines, some for use on Mars and Venus, others for the Jovian moons. We will have to bring the men here to learn to operate them. It'll take a few days. We'll get some men to work on new machines right away." He started to rise from his chair, but at that moment the coffee and sandwiches arrived. Greg grinned. "We may as well eat first." Mallory looked grateful and tried to keep from wolfing the food. The others pretended not to notice. * * * * * Grim hours followed, an unrelenting search over two planets and four moons for men whom Mallory considered loyal to his cause--men willing to risk their lives to throw off the yoke of Interplanetary. They were hard to find. Many of them were dead, victims of the purge. The others were in hiding and word of them was difficult to get. But slowly, one by one, they were ferreted out, the plan explained to them, and then, by means of the tele-transport, they were brought to the _Invincible_.