Shay was skimming just above the torrent, so low that she lifted a wake every time she banked.

Tally followed at what she guessed was a safe distance, hoping her tricked-up board was still reluctant to crash into the darkness-cloaked rocks and tree branches. The forest to either side was a black void full of wild and ancient trees, nothing like the generic carbon-dioxide suckers that decorated the city. The moonlit clouds above glowed through their branches like a ceiling of pearl.

Every time Shay screamed, Tally knew she was about to follow her friend through a wall of sprayleaping up from the maelstrom. Some shone like white lace curtains in the moonlight, but others struck unexpectedly from the darkness. Tally also found herself crashing through the arcs of cold water rising from Shay's board when it dipped or banked, but at least she knew when a turn was coming.

The first few minutes were sheer terror, her teeth clenched so hard that her jaw ached, her toes curled up inside her special new grippy shoes, her arms and even fingers spread wide for balance. But gradually Tally grew accustomed to the darkness, the roar of water below, the unexpected slap of cold spray against her face. It was wilder, and faster, and farther than she'd ever flown before. The river wound into the dark forest, cutting its serpentine route into the unknown.

Finally, Shay waved her hands and pulled up, the back of her board dipping low into the water. Tally climbed to avoid the wake, spinning her board in a tight circle to bring it to a smooth halt.

"Are we there?"

"Not quite. But look." Shay pointed back the way they'd come.

Tally gasped as she took in the view. The distant city was a bright coin nestled in darkness, the fireworks of New Pretty Town the barest cold-blue shimmer. They must have climbed a long way up; Tally could see patches of moonlight rolling slowly across the low hills around the city, pushed along by the light wind that barely tugged at the clouds.