Sometimes the botflies called for help.

This one had seen something it didn't understand in the transition zone. As far as it could tell, one of the Calvin cyclers was splitting in two. Perreault mounted the line and found herself floating above an ephemeral still-life. Shiny new cyclers sat along the shore, miracles of industrial photosynthesis, ready to braid raw atmosphere into edible protein. They appeared intact. A bank of latrines and a solar crematorium had been freshly installed. Light stands and blankets and piles of self-assembling tents lay on neat rows of plastic skids. Even the cracked bedrock had been repaired to some extent, autofoam resin injected into the fissures, remnants of sand and cobble replenished and raked halfheartedly over the ruined shoreline.

The restoration crews had gone; the refs had not yet come. But there were fresh footprints on the sand, leading into the ocean.

They came from there, too.

She called up the footage that had triggered the alarm. The world reverted to the garish, comforting false color that machines use to communicate their perceptions to the flesh-constrained. To human eyes, a Calvin cycler was a shiny metal coffin built for a minivan: to the botfly it was a muted tangle of EM emissions.

One of which was sprouting a bud—a little cluster of radiating technology separating from the cycler and weaving uncertainly toward the water. There was also a heat signature, inconsistent with pure tech. Perreault narrowed the focus to visible light.

It was a woman, all in black.

She'd been feeding from the cycler. She hadn't noticed the approaching botfly until it was less than a hundred meters away; then she'd startled and turned to face the lens.

Her eyes were completely white. They held no pupils at all.

Jesus, Perreault thought.

The woman had lurched to her feet as the botfly neared, staggered down the rocky incline. She'd seemed unused to the operation of her own body. Twice she'd fallen. Just short of the waterline she'd grabbed something on the beach—swim fins, Perreault saw—and pitched forward into the shallows. A broken wave had rolled uphill and engulfed her. When it receded the shore was empty.

Less than a minute ago, according to the logs.

Perreault flexed her fingers: twelve hundred kilometers away, the botfly panned down. Exhausted water ebbed and flowed in thin foamy sheets, erasing the creature's footprints. Pacific surf pounded a few meters ahead. For a moment Perreault thought she might have glimpsed something in that confusion of spray and swirling green glass—a dark amphibious form, a face almost devoid of topography. But the moment passed, and not even the botfly's enhanced senses could bring it back.

She replayed, and reconstructed: