The galaxy, for a moment, looked frozen. Claire’s ship pitched on its axis and she had a passing view of the stars in lockstep with her angle through the forward windows. From orbit, especially this low, the distant blazing suns were always sweeping by. The ship’s current altitude, 326 kilometers, had her completing an orbit in just over ninety minutes.

The ranging radar pinged at her. She was less than thirty kilometers from the errant satellite. With a sweep on the controls, she swung the cockpit around on its internal gimbals. For a moment she was in darkness. Only another couple of hours and she would be done for the month. Back to Levithab for two weeks in the station’s gravity spin. After three months on call–basically meaning out all day every day–and a full week in the Demeter’s tiny cockpit and living quarters, she really needed a break. The ship was starting to feel dank and lived in, like old socks that needed a wash, rinse and airing.

The hull’s underside window slots rolled into view as the cockpit slowed. It locked into a position with a heavy clunk. Now she was looking along the ship’s underside, the long, sleek groove with the six chunky bulbs of the grabbers. Below she could see the snowy Andes.

Following the turnaround she called up a hot soup from the dispenser and after a moment a silver tube slid into the dispenser’s slot. Putting the nozzle into her mouth she sucked gingerly. Minestrone. Mashed, by necessity, but still thick and good.

“Claire?” the radio squawked at her. Mandy, back at the McKinnon outpost dispatch. Claire liked McKinnon. After time in Demeter it always felt spacious and clean. Nothing like Levithab, but then that station catered to the tourists and executives. McKinnon was strictly a maintenance hub.

“Hi Mandy,” she said. Mandy was always cheerful and upbeat. She was always in the process of ditching a boyfriend or wooing someone new. Nothing seemed to last more than a week or two. “I’m coming up on our sat. Sweepstar 36. I’ve got a visual. Nasty angle on her solar panels here.”

“I can see you on my scope.”

“It looks like a twenty minute job at most. I’ve got spares on board.” Easy, she thought. Unbolt the sail with the Demeter’s claws, bolt in a new strut and fix the panels onto that. She could do it all from the cockpit through the screens.

“Yeah, sorry honey, I’m going to have to ask you to ditch that and take on a new assignment.”

Claire’s shoulder’s slumped. She could see the satellite, a pinprick of light moving in at her. “Don’t do this. I’ve got leave coming up. Soon as I’m done with this cold little Sweepstar, I’m having time off. You didn’t forget that did you?”

“It’s an emergency.”

“Mandy, it’s always an emergency.” People wanted their communications now. They wanted their Google updates right now. No one could wait a couple of days. No one could wait an hour.

“Edison!” shouted Jiaying. “Wait!”

How could anything so big move so fast?

The gorilla’s leap ricocheted off the metal carapace of a deactivated tunneler, up to the stone ceiling of the underground gallery. Edison scrambled into a dark passageway.

Jiaying launched herself after it, underclocked compared to Edison. Her exhausted muscles couldn’t pace his, even in Martian gravity. Sweat plastered hair against her face. She couldn’t brush it away because of her suit helmet.

Before she lost the transmitter link, she snapped the telemetry from Edison’s suit: power, water and air all 100%. Her suit recycled her urine, but she was below 50% on everything else.

“Bring it back,” Blake had ordered. “Before the damn thing starts taking tunnelers apart!”

You reap what you sow, she thought. She reached the upper passageway, stone walls gnawed away by a tunneler. Her suit lights panned the empty length.

No trace of the gorilla.

Jiaying had glimpsed Edison’s dark face through his helmet before he’d leapt away. No anger or desperation burned in those deep-set eyes, only sadness.

Now she wasn’t even picking up a signal from Edison’s transponder. He was too deep in the warren of Martian tunnels. Which made her claustrophobically aware of millions of tonnes of rock pressing down above her. She took slow Tai Chi breaths. The way in is the way out.

Jiaying and Edison had arrived on the resupply ship from Earth 26 Martian days ago. But two days ago, Edison had refused to come out of Warren #2.

Blake and his mining crew could hardly believe their good fortune.

They’d never concealed their dislike of Edison; he’d gotten the project back on schedule after they’d failed miserably. Edison was a gene-spliced idiot savant, a miracle worker at repairing heavy machinery. Half the tunneling machines had been out of service when Jiaying and Edison arrived. Thanks to Edison, everything was running again, excavating a deep radiation-shielded expansion for the colony.

But then he ran.

Reaching a tunnel intersection, she looked up at the camera-comm router on the ceiling. Edison had neatly disassembled it, leaving all the parts for future repair. Over the past two days, he’d disabled hundreds of them, enraging the men. The heads-up display in her helmet showed a wire-frame image where she was in the warren, but the dots marking all the cameras were unlit. That was also why her radio didn’t work underground. If an accident were to happen…

“It trusts you,” Blake had said. “It won’t let the rest of us near it.”

Then he’d given her the blaster: the kind that only ship captains and security chiefs were allowed to have. She’d tried to refuse it. “It’s too dangerous!” He wouldn’t let her.

“Use it if you can’t coax your pet out of the warren. Or if you see any more signs of sabotage. Then your job is to take it out. Blast it out of existence. We don’t have time for this. The project has to finish on schedule.”

“He’s already bought you time: months, maybe a year!”

“Edison served its purpose. The company created it. The company can decommission it.”

“He’s not a machine!”

“Cyborg, wild animal, whatever. Not a citizen of Mars.”

When she hadn’t found him yesterday, she’d spent the night in the warren, further depleting her air and power. She’d barely slept, waking either from a nightmare of being trapped in the warren, or of Edison taking the blaster from her pack. I wish I’d never taken the damned thing. She’d slept with her arms around her pack, suit heaters keeping her from freezing in the dark.

After training with Edison for over a year, she thought she knew him.

But Mars wasn’t the Congo; it wasn’t even Earth. There were no forests, no birds, no insects. Something in Edison had snapped in the tunnels, like a soldier with PTSD. Who knew what he’d do? If my life depended on it, could I shoot him? She hoped she wouldn’t have to find out.

Jiaying turned off her suit lights and switched her cameras to infrared.

Edison’s footprints in the gravel appeared as faint heat images nearly washed out by the heat radiating from her suit. She jogged down the tunnel lit only by ghostly infrared. Soon she came to the top of another gallery. Here, Edison’s heat trail vanished in the vast open space. He’d leapt, taking one of the tunnels leaving the gallery. If she picked the wrong one, his trail would be cold by the time she picked another. Choose, woman. The gallery had a tunnel sloping up to the surface. She picked it.

A minute later, she realized it was the wrong choice. Dammit, Edison, where did you go? At this point, so close to the surface, she decided to go all the way up.

The thick pressure door at the top was closed. Although the tunnels weren’t pressurized for colonists yet, all the surface doors were kept sealed because of the radiation. She reached out her right hand, ring glowing through her translucent glove. In response, the door forged of Martian iron slid aside. Once she walked through, it slid shut behind her. Her ring opened the next door as well. Now she stood at the exit of the bunker, looking out on the polar landscape. Pale brownish-red desert surrounded her; no CO2 frost in this season. The surface was bathed in weak sunlight. She scanned the sky till she spotted the small bright disk of Sol.

Her suit’s online interface chirped. She had reception.

“Did you get it?” asked Blake.

It. She clenched her jaw. “I saw Edison near a tunneler.” She made a point of using his name.

“Did you damage the tunneler when you fired?”

“I didn’t use the blaster.”

“Why the hell not?! I showed you how to use it, girl! If you had a clear shot…”

She didn’t reply. I’m so tired. Her dreams of coming to Mars had been crushed like gravel in the tunnels weeks ago.

She heard Carlos’ voice in the background. “Tell Jane-girl to get her ass over–”

She heard the shuffle of Blake’s hand covering his communicator. Jane was what the men called her behind her back. They called Edison Cheeta.

Blake spoke again. “Jiaying, you’re at grid C5. I want you to head across the surface to the bunker at B3. There’s a tunneler in the gallery below, one of our small rock cutters. I’ve loaded a command sequence in your ring to order the tunneler to surface for new programming.”

“Programming for what?”

Silence. Then Blake growled, “We’ve got a project to run. Maybe you forgot while you were pet-sitting. B3. You want me to send you mapping–”

“No.” She bit back a retort that would only cause more trouble with the men. “I got it.” The sooner she was beneath the surface, offline again, the happier she’d be.

She took her bearings from the heads-up display and loped across the surface: high, leaping strides like a princess of Mars. Her feet kicked up rooster-tails of brown sand behind her.

The warren was laid out as a grid, bunkers sprouting like prairie dog hills. It didn’t take long to get to B3. Her ring opened the outer door. It slid shut behind her and she opened the inner door, unveiling the mine-like depths. She felt the vibration of a tunneler through her boots.

She took a few Tai Chi breaths, then descended toward the gallery. The vibration through stone felt like a rocket under thrust. Dust churned in perpetual motion: a quantum whirlpool, rock chips bouncing off her suit and helmet. The haze kept her from seeing more than a couple meters ahead, but her ring glowed red through her translucent glove, indicating proximity of a tunneler. She pirouetted slowly, holding out her arm to see which direction glowed brightest.

That way.

She followed the ring’s direction, arm outstretched. Abruptly the vibration ceased. As the dust slowly sifted down, she saw the tunneler embedded halfway in rock. A dozen mechanical arms gripped the stone wall like a metal tick. The dust-coated tunneler was smaller than most, engineered for drilling service crawl tubes. Atomic power pulsed within its belly. “You see me, don’t you?” she said.

A beam from her ring darted to it through the dust, conveying Blake’s commands. The tunneler extracted itself from the opening in the wall and turned jerkily, camera-stalk eyes regarding her. Then it ascended toward the tunnel where she’d come in.

She should have recharged her suit’s power and air when she was in the bunker. Well, I’m not going back up there with the tunneler. She sipped water from the tube in her helmet, then set off through the tunnels back toward C5.

Just let me talk to you, Edison.