"Don," said his wife seriously, "rules is rules and electricity and energy are things I'm none too clear on. But I do know my husband. And when he gets up out of a warm bed in the middle of the night to go roaming through a frozen world, it's urgent. And since the man in question has been married to me for a number of years, getting up out of a warm bed and going out into snow and ice means that the urgency-angle is directed at whatever lies at the other end. I want to go see--and I'm going to!" Channing nodded absently. "Probably a wild-goose chase," he said. "Ready?" Arden nodded. "Lead on, curious one." Channing blinked when he saw the light in the room where the solar intake tubes were. He hastened forward to find Wes Farrell making some complex measurements and juggling a large page of equations. Farrell looked up and grinned sheepishly. "Couldn't sleep," he explained. "Wanted to do just one more job, I guess." Channing nodded silently. Arden said: "Don't kid anybody. Both of you want to know why a fuse should blow on a dead line." Farrell grinned and Channing nodded again. "I--" started Channing, but turned as the door opened. "Thought we'd find you here," said Barney Carroll. Jim Baler added: "We got to arguing as to how and why a fuse should blow on an empty line and decided to ask you." Arden squinted at Jim. "Did it ever occur to you that we might have been in bed?" Barney grinned. "I figured if we were awake from wondering about it, so would you-all. So--" Jim interrupted. "So what have you found?" Channing shook his head. "Ask Wes," he said. "He got here first and was measuring the deflecting electrode voltages when I arrived. I note that he has a hunk of copper busbar across the main fuse terminals." Wes smiled sheepishly. "Had to," he said. "Short was really shorted!" "So what have you found?" Farrell pointed to a place on a chart of the station. "About here." "Spinach," said Channing, "there isn't anything there!" Farrell handed the figures to Don. "That's where the short circuit load is coming from," he said. "Up there," said Channing, "I'll bet it is hitting close to seventy or eighty degrees below zero. A supercold condition--" He paused and shook his head. "The tube room reached absolute zero some time ago," he said, "and there's no heavy drain to that position." "Well?" demanded Arden, yawning. "Do we wait until tomorrow morning or go up there now?" Channing thought for a moment. "We're due to leave in the morning," he said. "Yet I think that the question of why anything up in an empty section of Venus Equilateral should be blowing fuses would belabor us all of our lives if we didn't make this last screwball search. Let's go. Wes, get your portable sun-finder, huh?" "His what?" demanded Arden.