Janer felt his head twinge almost warningly. He remembered drinking sea-cane rum—well, remembered starting to drink it. After a certain point things had become rather fuzzy.

He paused at the door, gesturing back to the cryocases. ‘The hornets…’

‘They’ll be fine. I’ll bring ‘em down with the cargo I have to deliver. And you can come down with me too. You’re our only human passenger.’

Janer didn’t respond to the slight query in the Captain’s voice.

Ron added, ‘Don’t get many passengers, not inside the runcible network.’

Janer didn’t rise to that either.

Only when Erlin moved the underwater remote eye, for a better view of the colony, was it attacked by leeches that had soon forgotten the device was no source of meat, so she was glad to have found this rocky marine peak to which it could cling with its three sharp legs. Not that leeches could damage the device, but when they swarmed they did tend to block her view of the ostensible reason for her being here.

The whelks were all of a similar size and bore near-identical shell markings. Each spiral shell was about half a metre from base to tip, pyramidal, and glittering with whorls of iridescence. Sitting in the mouth of her temporary home—it was Polity technology: the kind that could be inflated in minutes and, when ballasted, stood as solid and impenetrable as a stone house—Erlin gazed at the image on her fold-up screen, remaining perplexed and fed up. These molluscs were neither frog nor hammer whelks, and were actually quite boring. Her gaze wandered from the screen. Boredom, if she was to acquire that ‘long habit of living’ to which Ambel often referred, was something she must avoid. She felt the black pit of ennui at her core, robbing her of volition and threatening to spill out. With almost a physical wrench she forced her attention back to the screen.

She had expected to move the eye, following the whelks’ migration around the island or deeper into the ocean, but they remained exactly in the same location. She had expected to see a lot more activity than this. Other whelk species were always hunting for food or trying very hard not to become food, and even though they were the sexually immature version of a larger deep-sea whelk, they manoeuvred in elaborate social pecking orders. The only sign of movement from these creatures was when small leeches, glisters or prill came too close. Then they snapped out squidlike tentacles to drag those creatures down and eat them. That was all they did: fed and sat and grew. She closed down the screen. The damned things had done nothing else for a whole year, which was why Erlin had tried to occupy herself with other studies on the island.

When she had arrived, the leech population was low and no individual leech longer than her finger. It seemed some event had denuded the island of anything larger than this prior to her arrival. Now those fingerlings were about the size of her arm, though there were fewer of them, and they fed upon small heirodonts creeping through the vegetation (she could hear their screams in the night). There had once been big heirodonts here, too—their bones were mounded on the beach, so obviously the same event that had cleared this place of bigger leeches had done for them as well, though why their bones were piled up she did not know. It frustrated her that she could not put together all the pieces of the puzzle: the leeches, the bones, the shattered peartrunk trees on either side of a lane of destruction driven over the middle of the island. Maybe some kind of storm? Maybe some kind of outside interference by humans, or even by the Warden? Whatever, she certainly intended to solve at least one puzzle before Ambel returned for her. And to do so she only needed to risk her life.

Erlin did not like invasive studies, but it was time for her to discover what was going on with that colony of whelks. Her various scans had been inconclusive, but then her equipment here was limited. She needed one of those creatures here, on the surgical table she had erected in her abode, so she could dissect it to divine the function of its parts. She opened up the screen again.

The camera had moved. It had been doing that a lot lately. Maybe an earth tremor, though she had felt none, or maybe it was malfunctioning. Making adjustments she brought the colony back into view. It seemed closer now, which was ridiculous. She closed up the screen, stood and, stepping back inside, placed the device on a rough table she had fashioned from peartrunk wood. From her sea chest she removed her diving suit and donned it. The thing was heavy—two layers of monofilament fabric sandwiching ceramal chain mail—but it was what you needed if you ever wanted to take a swim here and remain intact. Her haemolung breather would give her three hours underwater before its cells of artificial haemoglobin became overloaded. More than enough time, now she had resolved the difficulty in getting one of the creatures ashore. To that end she had made some additions to her harpoon gun. Now, when the barbed point penetrated shell and delivered the specially tailored nerve agent, airbags would inflate on the haft, dragging the chosen whelk to the surface. Then all she had to do was drag it ashore. Picking up her equipment she headed off.

The beach here was stony, consisting of agates, rounded nodules of rose quartz and bullets of chert. At the tide line she donned the haemolung, mask and flippers, took up her harpoon gun and, without more ado, entered the waves. Immediately leeches started to thud into her, their grinding tubular mouthparts trying to penetrate her suit. She ignored them, kept going till submerged. In a short while the attacks ceased; each nearby leech having ascertained that she must be a large crustacean like a glister.

Ten metres out, the bottom dropped sharply. She sculled slowly down into the murk, soon locating the peak to which her camera eye clung. Circling this she spotted an iridescent gleam to the gutlike rolls of stone which she had not noticed before. Soon she was above the whelks—out of tentacle range. Something shifted, a current shoved her sideways. Earth tremor? No, just the current. She aimed down at one of the whelks and fired. The harpoon chopped into its shell and the airbags expanded. Trailing a cloud of yellow ichor the creature rose to the surface with its tentacles clenched up inside it, the nerve agent having done its work. Erlin rose with it and swam quickly ashore, towing it behind by the harpoon’s monofilament. After detaching the harpoon’s barb, she rolled the creature through the shallows to the beach. A momentary pang of guilt touched her, but she dismissed it. These were primitive molluscs of a kind she had been eating, nicely broiled and dunked in spiced vinegar, for years.

Once ashore she stooped and picked up the mollusc, acknowledging to herself that without the changes the Spatterjay virus had wrought in her body, the creature would be too heavy to manage. Back in her abode she dumped it on the surgical table, then began removing her gear. From the sea she heard a huge splash, and peering out observed a disturbance in the water above the colony. Glisters probably—on tasting the ichor in the water. Returning to the table she placed a camera eye over it before getting to work. She used her vibroscalpel to slice from tip to base around the shell, then her Hooper muscles to pull the two halves apart. The shell, she saw, was surprisingly thin. The creature inside was octupoidal, and opening it up she saw it also possessed much the same anatomy as a frog whelk. Another huge splash from outside. Erlin stepped over and flipped up her screen, but it showed nothing but underwater murk. She returned to her dissection.

The creature seemed ill-formed—soft and immature—and she could not find its nascent sexual organs. That was very odd as, being this size, it should at least be approaching adulthood. Perhaps she had stumbled on an aberrant colony of mutants. Or perhaps these were whelks affected by some agent, some pollutant. It had happened on Earth a long time ago: creatures similar to this changing their sexual characteristics because of pollution by human birth-control chemicals or antifouling paints on boats. Some there now were also genfactored to grow simply as meat and so did not require sex organs. But here the process could not have been initiated by humans; there just were not enough of them, and their society was not sufficiently industrialized to affect their environment. Maybe some connection with whatever had happened here on this island? Erlin allowed her attention to stray back to her screen, and for a moment just could not fathom what she was seeing. Then the view came clear. She was now looking at her own dwelling, viewed from a point out at sea and some metres above the water.