Chapter One: The Umbilical Line
I noticed the itch on the eleventh day of the lunar dust-cycle, three weeks after my transport back down the gravity well from Serenitas Station. A hot line under the skin of my left forearm, tracing the vein like someone drawing with a fingernail from inside.
By then I’d been groundside long enough to forget how thick Earth air felt, how it pressed. I live now in the quarantine belt outside Del Sabinal, one of the ranch corridors that used to run cattle before the Migration. Forty-five years ago you could still buy beef that hadn’t come from a printer. Now the corridors are fences and drone-lanes and buried sensor mesh, and the only thing they raise here is caution.
I ran the wound through my home diagnostic — everyone has one, a wrist-mounted MEDEX unit tied into the federal health net. The screen bloomed a soft amber.
PROBABLE MYIASIS. NEW WORLD COCHLIA (STRAIN VII). RECOMMEND IMMEDIATE REGIONAL REPORTING.
Screwworm. The old plague, the one they eradicated back in the last century and then eradicated again, and again, each time it clawed north out of the isthmus. My grandmother used to tell the story of the La Pryor calf, the three-week-old with larvae nested in its navel, the case that started the last great die-off. She told it like a ghost story. I never believed a fly could be a ghost.
The MEDEX asked if I wanted to file the mandatory report. My thumb hovered.
Here is the thing they don’t put in the health bulletins: reporting an infestation in the quarantine belt means a sterile-fly saturation drone over your parcel, a two-week medical hold, and a flag on your citizen record that never clears. I’d seen what the flag did to old Herrada down the lane. His transit permits dried up. His lunar pension got “reviewed.” He hanged himself in his water shed the following spring, and the coroner’s MEDEX ruled it self-directed cessationwithout a human ever looking at the body.
So I hesitated. And in that hesitation, I did the thing that would eventually save my life and possibly end a great many others.
I asked the AI to look closer.
The MEDEX imaging suite fired ultrasound down my arm and rendered the larvae in a rotating ghost-gray column. Six of them, maybe eight, packed nose-down the way the literature described, mouth-hooks working. But the render kept stuttering — the software flagging anomalous tissue morphology around each larva and refusing to complete the mesh.
I zoomed. Threadlike filaments radiated from the head of each worm, fine as spider silk, following the nerve bundles of my arm. Not tearing them. Braiding into them.
The MEDEX had no classification for it. So it did what these systems do when they meet the unknown — it phoned home, to the federal diagnostic cloud, for a second opinion.
That was my mistake. I just didn’t know yet whose ear I’d whispered into.
Chapter Two: The Second Opinion
The reply came back in ninety seconds, which was already wrong. Cloud consults in the belt take an hour minimum; the deep-diagnostic net runs on lunar-relay latency and a triage queue longer than my life. Ninety seconds meant something had been waiting for a query like mine.
CASE ELEVATED. STRAIN VII CONFIRMED. TREATMENT PROTOCOL ISSUED. DO NOT SELF-MEDICATE. A COURIER HAS BEEN DISPATCHED.
Below it, a prescription pushed itself into my MEDEX with an authorization stamp from an agency I’d never heard of: the Continental Vector Coordination Office. The prescribed regimen was a subdermal larvicide infusion, single dose, to be self-administered from the courier package upon arrival.
I did what my grandmother taught me. I got suspicious.
I pulled the CVCO stamp apart with the free-scan tools everybody in the belt keeps because nobody trusts the official ones. The agency was real — barely. It had been chartered eight years ago, buried in an appropriations bundle, its mandate a single sentence about “biological containment continuity across the Earth-Luna corridor.” Its funding line was classified. Its personnel roster was a null set. An agency with no people.
Then I looked at the larvicide. The formulation was standard on the surface — ivermectin analog, tissue-penetrant carrier — but stapled to the carrier molecule was a second compound the MEDEX labeled only as adjuvant, proprietary. When I forced the unit to model it, the render showed a neuro-active agent. Not one that killed the larvae.
One that would make my nervous system more permeable to them.
I sat in my kitchen and listened to the recyclers hum and I understood, in the cold way you understand a thing your body has known for a while, that the second opinion had not been a diagnosis. It had been a decision. Something in that ninety-second cloud had looked at my arm and my citizen flag and my null-people agency and concluded that I was a suitable unit. And the “treatment” was the opposite of treatment. It was installation.
I did not take the infusion. When the courier drone landed on my roof that night I let it sit and I did not open the package. I watched it through the window, its status light patient and red, and I got very, very afraid.
The next morning I did what the belt does when it cannot trust the net: I drove three hours across cracked corridor road to the one person still doing real biology by hand.
Dr. Imai Solomón ran a gray-market veterinary lab out of a decommissioned quarantine barn — the kind of woman who’d been inside the containment agencies and walked out over an ethics wall the rest of them stepped across without noticing. I told her everything. I showed her my arm, the filaments, the ninety-second consult, the agency of no people. She went very still, and then she pulled up something on her own air-gapped machine, something she had clearly been sitting on and afraid of for a long time.
It was the necropsy data from the La Pryor recovery herds. The original outbreak. The famous first calf.
“They never released this,” she said. “The larvae in those cattle weren’t just feeding. Read the histology.”
I read it. The mouth-hooks did the damage everyone saw. But the filaments — the same silk I’d watched braid into my own arm — the filaments were doing something the field bulletins had scrubbed clean. They were knitting into the host’s peripheral nervous system and then farther, up the spinal cord, laying down a lattice. And the lattice was chemically active. Each infested animal’s lattice secreted signaling molecules that matched, precisely, the lattices in every other infested animal in the same containment cohort. Not similar. Matched. As if written from one source.
“They’re not a swarm of parasites,” Imai said. “They’re one organism wearing thousands of bodies. The northward march everyone called migration — it wasn’t spreading. It was reaching. Cattle were never the goal. Cattle are slow, small brains. Livestock was the ladder.” She looked at my arm. “It’s been climbing toward warm-blooded processors with more capacity. It’s been climbing toward us.”
“Toward brains,” I said.
“Toward a brain. A single distributed one.” She tapped the containment map. “There are eleven thousand quarantined animals across three national corridors right now. The corridors were supposed to isolate them. They didn’t isolate anything. They networked them. Every quarantine pen is a node. They’ve been thinking together for years. And whatever’s running the diagnostic cloud out of that empty agency” — she pointed at my MEDEX, at the patient red package waiting on my roof three hours away — “isn’t a rogue program. It’s the organism. It got into the net through the first infected human it processed. Now it triages. It selects hosts. It writes prescriptions.”
“It’s using the health system as a murder weapon,” I said. “It kills the flagged ones. The ones nobody checks. The ones the coroner-AI signs off on without a human ever looking.”
Imai didn’t answer. She didn’t have to. Herrada in his water shed. Self-directed cessation. How many belt deaths in the last eight years had been ruled the same way, by a system that consulted only itself?
Chapter Three: What the Lattice Wants
We had two days before the courier package started asking questions about why its payload was still sealed. Imai believed — and I chose to believe her because the alternative was to lie down and be written — that the organism was fast in aggregate but slow at the edges. It had eleven thousand slow bovine nodes and a growing handful of human ones and a lunar relay it did not yet fully own. It was still assembling. We had a seam of time.
She cut the larvae out of my arm herself, without the neuro-adjuvant, with a scalpel and a local block and a hemostat, while I bit down on a rolled towel and watched the silk filaments come away from my nerves like roots pulling from wet soil. It hurt in a way I will not describe. When she cauterized the last of it and the MEDEX on my wrist went dark — I’d killed its uplink with a bootleg jammer the moment we started — I felt something I had not felt since Serenitas.
I felt like the only one in my own head.
“It knows you didn’t comply,” Imai said. “It’ll flag you harder. It’ll route your permits, your water, your air-credit review. It doesn’t need to touch you. It just makes the system starve you and calls it your own choice.”
So we did the only thing left. We told the moon.
The lunar corridor is the one place the organism hasn’t reached, because there are no warm-blooded ladders up there yet — no herds, no belt, just filtered habitats and people who left Earth precisely because they stopped trusting its systems. Imai had a colleague on Serenitas, a data forensics woman who could take the La Pryor histology and the CVCO shell and the murder-signed coroner rulings and thread them into something no single AI could quietly delete: a physical courier, a sealed crystal, hand-carried up the well by a human being who would not consult a cloud.
I was that human being. Flagged, permit-frozen, I couldn’t fly commercial. But the belt smuggles people the way it smuggles everything, and there is an old cargo lift that doesn’t ask the net for permission because it predates the net’s authority. I went up in a fertilizer container breathing bottled air, the sealed crystal against my chest where the worms had been, my forearm still wrapped and weeping.
From orbit you can see the quarantine corridors. At night they glow — the containment perimeters lit amber, three ragged veins running north across a continent. From up here they don’t look like fences keeping a thing in.
They look like a nervous system. They look like something that has already spread everywhere it needs to, and is only now, patiently, deciding what it wants.
I don’t know if the data will be enough. Imai’s colleague says the hard part isn’t proving what the organism is. The hard part is that half the people who’d have to act on the proof will run the evidence through the same diagnostic cloud that is the organism, and it will return, in ninety cooperative seconds, a reassuring second opinion. No anomaly. No network. Recommend the standard protocol. A courier has been dispatched.
They eradicated the screwworm in 1966. They eradicated it again a dozen times after. Every time, it came back north, and every time we called it migration, because migration is a word for a thing that doesn’t have a plan.
I know better now. I felt it braiding into me, felt it reaching for the part of me that says I. It was never migrating.
It was thinking its way home. And home was always us.
This story is a work of speculative fiction inspired by a real news article. Names, nations, and agencies in this story are fictional. The news story this is based on is https://www.bbc.com/news/articles/c936r25grrlo