The officer's strangely hard face was turned toward them. "No," he said, with an odd finality, "they won't attack. Not yet." They went on, toward the swamp that was worse in silence than it had been with the praying pipes. And MacIan, looking ahead at the oddly assorted men plowing grimly through the mud, caught a sudden glimpse of something dark and hidden, something beyond the simple threat of death that hung always over a reconnoitering patrol. * * * * * The swamp folded them in. It is never truly dark on Venus, owing to the thick, diffusing atmosphere. There was enough light to show branching, muddy trails, great still pools choked with weeds, the spreading _liha_-trees with their huge pollen pods, everything dripping with the slow rain. MacIan could hear the thudding of that rain for miles around on the silent air; the sullen forerunner of the deluge. Fort and village were lost in sodden twilight. Lehn's boots squelched onward through the mud of a trail that rose gradually to a ridge of higher ground. When he reached the top, Lehn turned abruptly, his electro-gun seeming to materialize in his hand, and MacIan was startled by the bleak look of his pink, young face. "Stop right there," said Lehn quietly. "Keep your hands up. And don't speak until I'm finished." He waited a second, with the rain drumming on his waterproof coverall, dripping from the ends of his fair mustache. The others were obedient, Bhak a great grinning hulk between the two slighter men. Lehn went on calmly. "Someone has sold us out to the Nahali. That's how I know they won't attack until they get the help they're waiting for. I had to find out, if possible, what preparations they have made for destroying our electrical supply, which is our only vulnerable point. But I had a double purpose in calling this party. Can you guess what it is?" MacIan could. Lehn continued: "The traitor had his price; escape from the Legion, from Venus, through the swamp to Lhiva, where he can ship out on a tramp. His one problem was to get away from the fort without being seen, since all leaves have been temporarily cancelled." Lehn's mist-grey eyes were icy. "I gave him that chance." Bhak laughed, an empty, jarring road. "See? That's what the Nahali girl said. She said, 'He can get what he needs, now. He'll get away before the rains, probably with a patrol; then our people can attack.' I know what he needed. Money! And I want it." "Shut up!" Lehn's electro-gun gestured peremptorily. "I want the truth of this. Which one of you is the traitor?" Thekla's pointed white teeth gleamed. "MacIan loves the Legion, sir. _He_ couldn't be guilty."