Incandescence

When Zak had first invited her, she'd told him an old joke: the easy way to reach the Null Line from the garm quarter was to travel to the shomal quarter, and from there the journey would be downhill all the way. Rather than expressing amusement or irritation, Zak had responded by showing her yet another of his maps.

«These lines are paths that lead neither up nor down,» he'd explained. «I call them 'levels'. I've arranged their spacing so that climbing from one level to the next is an equal effort in each case. Counting the lines to be crossed will tell you how much work any journey requires.»

In fact, counting the lines told Roi nothing new; the whole point of the joke was that everyone knew it would take at least as much effort to reach the shomal quarter from the garm as to travel to the Null Line itself. Still, the map made this fact clear at a glance, because the Null Line was level with the boundary between the quarters.

Zak insisted that he'd drawn this second map, not by laboriously measuring the weight lines on the first map and marking off increments of effort, but by a kind of reasoning that started with the underlying mathematical rule that described the pattern of weights, and led to a new rule describing the shape and spacing of these levels. Roi was astonished, but when she'd asked for more details she'd found his explanation impenetrable. «When you come to the Calm, when you have time to ponder these ideas at leisure, it will all make sense,» he'd promised.

Roi planned the journey to take twelve shifts in all: four spent traveling up to the Null Line, five visiting Zak, and three for the easier return leg. She'd been with the team long enough for an absence like this to be acceptable; everybody needed to recuperate sometimes, and travel was a common form of recreation. If it also made you vulnerable to recruitment, the unspeakable truth was that a certain amount of turnover kept the teams fresh, and if a tired or restless worker was ambushed it was not the end of the world.

It was easy to ponder these matters as abstractions, but when Roi woke in the shelter of her crevice and faced the reality of setting out in the opposite direction to all of her team-mates, she realized that she'd chosen the hardest time to leave. By the end of each shift she craved solitude, but on waking all she could think about was company and cooperation. She'd made no close friends in this team, but that wasn't the point: it gave her the same sense of accomplishment to work beside the most taciturn stranger as it did beside someone sociable and garrulous whose history she knew inside-out. Work was work; everything else was superfluous chatter, however delightful that could be.

As she eased herself out of her resting place, she resolved to follow her plan regardless. The more difficult it was to begin the journey, the more she would feel reassured that her attachment to the team was secure.

Zak had given her a series of maps that showed the way between their usual meeting place and a rendezvous point that he'd chosen near the Null Line. Roi had decided not to follow his suggested route precisely; whether she trusted him or not, it would be more enjoyable to take a few detours and keep the journey unpredictable. She'd been in the Calm a few times, and had even worked for a while in the sard quarter, but Zak's haunts were further rarb along the Null Line than she'd ever gone, and there would be plenty of territory along the way that she'd never seen before.

In the first tunnel she entered, she encountered a crowd of workers descending for the start of their shifts. She deferred to their numbers and climbed along the matted ceiling, trying to exhibit an uncomplicated purposefulness with her gait even as she struggled to keep her footing. The tangle of vegetation seemed imbued with malice; among the crops at the edge the same weeds would be proliferating luxuriantly in the unfiltered wind, and she would not be there to keep them in check. Five of her team-mates passed her below, oblivious to her presence. She was alone and useless; no wonder she was invisible to them.

What was she doing? Taking a rest. Satisfying her curiosity. Scratching an itch so she could keep on working, with all the more energy and dedication.

Taking a rest, and walking into an ambush. Zak was probably just the healthiest member of his team, the only one who still possessed enough strength to travel deep into the garm quarter. Once Roi arrived in his territory all the others would float around her, weakened and deformed by their countless shifts of weightlessness, ready to induct her into their deranged schemes.