Dad and Mum and Jeremy had moved aboard the Long March two days ago, dragging Wednesday along in their glassy-eyed optimistic undertow. There were holes in the facade, empty figures in the family photograph. Cousin Jane, Uncle Mark, Grandpa and Grandma weren’t coming. At least, not in the living flesh; they were dust now, burned by the godwind that would blow past the station in four days’ time.

Harried wardens had shown Wednesday and her family to their deck, corridor, segment, and cell. They had a family space: four sleeping pods and a two-by-three living room with inflatable furniture. It would be home for the voyage. They were to eat in the canteen on Rose Deck, bathe in the communal hygiene unit on Tulip, and count themselves lucky for being alive at all — unlike Mica and her husband, friends and neighbors who’d been home on a month’s leave for the first time in five years when the Incident took place.

Within hours, Wednesday had been bored silly. Her plants were dead, her nerve garden shut down for cold storage, and they had been ordered to remain in steerage until after departure, with nothing but the inane prattle of the entertainment net and the ship’s lobotomized media repository for company. Some budding genius from New Dresden — a more regimented society than Moscow’s — had decided that horror interactives and books were unfit for minors, and slapped a parental control on that section of the database. Her friends — those she counted as friends — were mostly on the other ships. Even Herman had told her he’d be unable to talk after the ship’s first jump. It would have been more fun if they’d had cold sleep tankage, but there was no way that the station’s facilities could process more than a couple of hundred at a time: so Wednesday was to be a martyr to boredom for the next week.

The only consolation was that she had a whole new world to explore — a starship. She hadn’t been on a ship since she was eight, and the itch to put learning into practice was irresistible. Besides, Herman said he knew and could show her the layout of this particular vessel. It was a late-model Backhoe series heavy lifter fabricated in the yards over Burgundy, with life-support superstructure by Thurn und Taxis Pty of New Dresden. It was just a trash hauler — fusion rockets, contrarotating spin wheels — nothing as sophisticated as a momentum transfer unit or grav generators. Its jump module was a sealed unit purchased from someplace where they knew how to make such things; neither Dresden nor Moscow had the level of tech infrastructure necessary to throw naked singularities around. But Herman knew his way around the ship, and Wednesday was bored. So obviously it was time to go exploring; and when she told him, he had some interesting suggestions for where to go.

Wednesday was lousy at staying out of locked rooms. Her second-year tutor had summed it up: “She’s like a cat — takes a shut door as a personal insult.” She took her pick gun and tablet with her as a matter of course, not out of malice or a desire to burgle, but simply because she couldn’t abide not knowing what lay on the far side of a door. (The ship had a double-walled hull, and the only doors that breached into vacuum were airlocks. Unless she was stupid enough to pick a door with flashing pressure warning lights, heavy gaskets, and mechanical interlocks, she wasn’t running any risks. Or so she thought … )

The ship wasn’t exactly off-limits to passengers, but she had a feeling her presence would be discouraged if anyone noticed her. So she sneaked up into the central service axis and back down into the crew ring the smart way: sitting on the roof of a powered elevator car, her stiction pads locked to the metal as it swam up the tunnel, decelerating and shedding angular momentum. She rode it up and down twice, searching for ventilation ducts with the aid of a torch, before she made her move. She swam through darkened service shafts, down another tube, hitched a lift on the roof of a passenger car, and surfed all the way into one of the main ventilation bronchi. The maintenance moles in the airflow system left her alone, because she was alive and moving, which was just as well, really. After an hour of hobbiting around in the ducts she was tired and a bit disoriented — and it was then that she came across the filtration hood that Herman had told her to expect.

It sat in the floor of a cramped duct, humming softly to itself, laminar pumps blurring quietly in the twilight. A faint blue glow of ultraviolet lamps shone from the edges. Fascinated, she bent close to inspect it. Sterilizers aboard a star-ship? Only in the life-support system, as a rule. But this was the accommodation deck, so what was it doing here? A quick once-over of the mounting bolts revealed another anomaly — a fine wire leading down through a hole in the floor of the duct. It was obviously an alarm cable. Not the sort of unreliable IR sensor that might be set off by a passing maintenance pig, nor a nerve garden eyeball sensor to be bamboozled by shadows, but an honest old-fashioned burglar alarm! She attacked it with her multitool and the compact maintenance kit she’d acquired a few months ago. Wires were easy -

A minute later she had the filtration hood unbolted and angled up at one side. Dropping an eyeball through was the work of seconds. Her camera-on-a-thread — disguised as a toy spider — swam in dizzy circles, revealing a cramped room, locked inner door, shelves with boxes secured to four of the walls. Purser’s office or captain’s locker? Wednesday couldn’t tell, but it was obviously where they kept the high-value cargo, anything compact that had to be shipped in a safe under lock and key, accessible for inspection during the voyage. Deeds. Share certificates. Papers, orders, DNA samples, cypher keys, the odd rare piece of proprietary software. “Why don’t you go look?” a familiar voice prodded her. Herman blinked a schematic behind her eyes. “Observe: according to this original blueprint this room should he part of the Captain’s quarters.”

“Think I’ll find any treasure inside?” asked Wednesday, already looking for an attachment point for her rope. The lure of forbidden fruit was more than she’d ever been able to resist.

Locked doors. A teenage girl going through one of those phases. Modifications to a standard lifesystem. Stop all the clocks: a star has died. Blue plastic toy spiders. Confidential orders handwritten on dumb paper. Invisible playmates. Badge dropped down lift shaft. Respiration stops: the universe holds its breath. And …

Just outside the expanding light cone of the present a star died, iron-bombed.

Something — some exotic force of unnatural origin — twisted a knot in space, enclosing the heart of a stellar furnace. A huge loop of superstrings twisted askew, expanding and contracting until the core of the star floated adrift in a pocket universe where the timelike dimension was rolled shut on the scale of the Planck length, and another dimension — one of the closed ones, folded shut on themselves, implied by the standard model of physics — replaced it. An enormous span of time reeled past within the pocket universe, while outside a handful of seconds ticked by.

From the perspective of the drifting core, the rest of the universe appeared to recede to infinity, vanishing past an event horizon beyond which it was destined to stay until the zone of expansion collapsed. The blazing ball of gas lit up its own private cosmos, then slowly faded. Time passed, uncountable amounts of time wrapped up in an eyeblink from the perspective of the external universe. The stellar core cooled and contracted, dimming. Eventually a black dwarf hung alone, cooling toward absolute zero. Fusion didn’t stop but ran incredibly slowly, mediated by quantum tunneling under conditions of extreme cold. Over a span billions of times greater than that which had elapsed since the big bang in the universe outside, light nuclei merged, tunneling across the high quantum wall of their electron orbitals. Heavier elements disintegrated slowly, fissioning and then decaying down to iron. Mass migrated until, by the end of the process, a billion trillion years down the line, the star was a single crystal of iron crushed down into a sphere a few thousand kilometers in diameter, spinning slowly in a cold vacuum only trillionths of a degree above absolute zero.