There was no question. He recognized exactly what the youngling was doing, for he'd done much the same thing often enough in the past. True, he usually pursued his prey by scent, but now he understood how a ground runner must have felt when it realized he was on its trail, for the two-leg was using the link between them in exactly the same way. It was tracking him, and if it found him, it would also find Bright Water Clan's central nesting place. For good or ill, its ability to seek out Climbs Quickly would result in the discovery of his entire clan!

He stood for one more moment, heart racing, ears flat with mingled excitement and fear, then decided. He abandoned his original task and bounded off along an outstretched limb, racing to meet the approaching two-leg well away from the rest of his clan.

Stephanie's attention was locked on the trees below her now. Her flight had lasted over two hours, but she was drawing close at last. She could feel the distance melting away — indeed, it almost seemed the treecat was coming to meet her — and excitement narrowed the focus of her attention even further. The crown oak had thinned as she moved higher into the foothills. Now the woods below her were a mix of various evergreens and the crazy-quilt geometry of picket wood.

Of course they were, she thought, and her eyes brightened. The rough-barked picket wood would be the perfect habitat for someone like her little celery thief! Each picket wood system radiated from a single central trunk which sent out long, straight, horizontal branches at a height of between three and ten meters. Above that, branches might take on any shape; below it, they always grew in groups of four, radiating at near-perfect right angles from one another for a distance of ten to fifteen meters… at which point, each sent a vertical runner down to the earth below to establish its own root system and, in time, become its own nodal trunk. A single picket wood "tree" could extend itself for literally hundreds of kilometers in any direction, and it wasn't uncommon for one "tree" to run into another and fuse with it. When the lateral branches of two systems crossed, they merged in a node which put down its own runner.

Stephanie's mother was fascinated by the picket woods. Plants which spread by sending out runners weren't all that rare, but those which spread only via runner were. It was also more than a little uncommon for the runner to spread out through the air and grow down to the earth rather than the reverse, but what truly fascinated her was the tree's anti-disease defense mechanism. The unending network of branches and trunks should have made a picket wood system lethally vulnerable to diseases and parasites, but the plant had demonstrated a sort of natural quarantine process. Somehow — and Dr. Harrington had yet to discover how — a picket wood system was able to sever its links to afflicted portions of itself. Attacked by disease or parasites, the system secreted powerful cellulose-dissolving enzymes that ate away the connecting cross-branches and literally disconnected them at intervening nodal trunks, and Dr. Harrington was determined to locate the mechanism which made that possible.

But at the moment, her mother's interest in picket wood meant very little to Stephanie beside her realization of the same plant's importance to treecats. Picket wood stopped well short of the tree line, but it crossed mountains readily through valleys or at lower elevations, and it could be found in almost every climate zone. All of which meant it would provide treecats with the equivalent of aerial highways that could literally run clear across a continent! They could travel for hundreds — thousands! — of kilometers without ever once having to touch the ground where larger predators like hexapumas could get at them!

She laughed aloud at her deduction, but then her glider slipped abruptly sideways, and her laughter died as she stopped thinking about the sorts of trees beneath her and recognized instead the speed at which she was passing over them. She raised her head and looked around quickly, and a fist of ice seemed to squeeze her stomach.

The clear blue skies under which she had begun her flight still stretched away in front of her to the west. But the eastern sky behind her was no longer clear. A deadly looking line of thunderheads marched steadily west, white and fluffy on top but an ominous purple-black below, and even as she looked over her shoulder, she saw lightning flicker below them.

She should have seen it coming sooner, she thought numbly, hands aching as she squeezed the glider's grips in ivory-knuckled fists. She should have kept an eye out for it! But she was used to having other people — adult people — check the weather before she went gliding, and then she'd let herself get so excited, focus so intently on what she was doing, pay so little attention—

A harder fist of wind punched at her glider, staggering it in mid-air, and fear became terror. The following wind had been growing stronger for quite some time, a small, logical part of her realized. No doubt she would have noticed despite her concentration if she hadn't been gliding in the same direction, riding in the wind rather than across or against it where the velocity shift would have to have registered. But the thunderheads behind were catching up with her quickly, and the outriders of their squall line lashed through the airspace in front of them.

Daddy! She had to com Daddy — tell him where she was — tell him to come get her — tell him—!

But there was no time. She'd messed up, and for the first time in her life, Stephanie Harrington confronted her own mortality. All the theoretical discussions of what to do in bad weather, all the stern warnings to avoid rough air, came crashing in on her, and they were no longer theoretical. She was in deadly danger, and she knew it. Countergrav unit or no, a storm like the one racing up behind her could blot her out of the air as casually as she might have swatted a fly, and with just as deadly a result. She could die in the next few minutes, and the thought terrified her, but she didn't panic.

Yes, she had to com Mom and Daddy, but it wasn't as if she didn't know exactly what they'd tell her to do if she did. She had to get out of the air, and she couldn't afford the distraction of trying to explain where she was while she tried to get down safely… especially through that solid-looking green canopy below her.

She banked again, shivering with fear, eyes desperately seeking some opening, however small, and the air trembled as thunder rumbled behind her.

Climbs Quickly reared up on true-feet and hand-feet, lips wrinkling back from needle-sharp white fangs as a flood of terror crashed over him. It pounded deep into him, waking the ancient fight-or-flight instinct which, had he but known it, his kind shared with humanity, but it wasn't his terror at all.

It took him an instant to realize that, yet it was true. It wasn't his fear; it was the two-leg youngling's, and even as the youngling's fear ripped at him, he felt a fresh surge of wonder. He was still too far from the two-leg. He could never have felt another of the People's mind glow at this distance, and he knew it, but this two-leg's mind glow raged through him like a forest fire, screaming for his aid without even realizing it could do so, and it struck him like a lash. He shook his head once, and then flashed down the line of what humans called picket wood like a cream and gray blur while his fluffy tail streamed straight out behind him.

Desperation filled Stephanie. The thunderstorm was almost upon her — the first white pellets of hail rattled off her taut glider covering — and without the countergrav she would already have been blotted from the sky. But not even the countergrav unit could save her from the mounting turbulence much longer, and—