Ruth Okafor wipes yellow sap from the orchard handrail before Denise Bell can inspect it, then finds another bead swelling beneath her thumb. At seventeen, Ruth has learned that a clean workstation earns signatures, and signatures keep her berth on Jupiter. Earlier that day, she cut a sour-smelling blister from an inspection branch and sealed it in an unlabeled jar beneath her bunk. Now the ventilation tastes like spoiled fruit, passengers are retching behind cabin doors, and Denise is turning over leaves Ruth had arranged to look healthy.
Felix Tran arrives to repair a pressure latch and catches Ruth scrubbing the same rail again. When he takes her wrist to check a sap burn, she holds his hand longer than necessary, then asks about his tools. Before he can answer, a swollen airway shakes the grating beneath them. Denise orders the infected lung isolated, but its valves will not close.
Ruth measures Felix’s shoulders against the maintenance hatch. He steps away from her hands and asks what she has not told them. She retrieves the jar. Denise makes her kneel beside the damaged branch and point to every cut, then strips Ruth’s clearance badge from her jacket. The infection has spread beneath tissue that now looks sound; sealing the lung along the inspection line would leave diseased growth connected to the occupied decks.
Denise blocks the hatch when Ruth volunteers to enter. Ruth puts her finger through the measuring frame beside Felix’s name: no adult gardener will fit, and Felix cannot distinguish healthy tissue from what she removed. Denise finally hands them the only portable oxygen cylinder. Ruth tells Felix exactly how far the infection might extend and asks whether he will come. He takes the second mouthpiece before taking her hand.
They reach the infected lung with eleven minutes before the next contraction crushes the passage home. Yellow droplets shake from its ceiling onto their sleeves. Ruth’s pruning hook slips against a rubbery fold, releasing the smell of fermented pears through her mouthpiece seal. Denise guides her by radio, naming the color and thickness of each safe layer. When Ruth exposes a clear band beneath the swelling, Felix frees the jammed valve—but its closing movement pulls the passage tight around their legs.
Felix leads her into a reinforced recess just large enough for two. Inside are a folded clean cloth and a little rectangle of polished inspection glass facing an observation slit. Ruth recognizes the same care he has spent cleaning the service-walk window. He had meant to bring her here without a repair to explain it.
The valve’s displaced collar is narrowing their way out. Felix dismantles the recess braces and passes them to Ruth to wedge across the passage, destroying their shelter. Ruth orders him to take the cylinder and go first; he plants his boots against the membrane and holds her mouthpiece where she cannot pretend to miss it. They crawl together, moving the cylinder between them. Denise catches Ruth’s wrist at the hatch while Felix pushes from behind. They spill onto the grating as the braces buckle inside.
The lung seals. Cabin air begins moving again. Ruth leans against Felix, too sick to stand, until a passenger’s cup of water acquires a yellow film.
Denise takes them through the orchard, carrying the sealed jar against her chest. The infection has entered the root gutters that feed the remaining terraces. Isolation bought hours, not a cure. When Ruth reaches for a pruning hook, Denise physically closes the cabinet: Ruth has no clearance, and another concealed cut could finish the ship.
Felix brings Ruth water instead of a broken valve. She nearly sends him to inspect the drains, catches herself, and asks him to stay. Together they notice that sap clings to the outside of his coverall elbow but not the polished metal reinforcement. Ruth drips contaminated water across a scrap of living root and an adjustable collar. The root develops a pale swelling; the metal remains clean. They carry both to Denise, who leads them to her old specimen shelves.
There, jars from a long-closed deck contain the same yellow sediment. Denise takes one down and shows Ruth a branch that she cut too conservatively years ago. She had saved an occupied compartment and lost the next one anyway. Rather than send Ruth away, she puts the old specimen beside the new one and helps her open a drainage cover. Beneath it, healthy roots have grown through manufactured collars, making bridges between terraces that were supposed to be separate.
They begin lifting root bundles clear of the gutters. Felix loosens fittings while Ruth and Denise cut and seal specimens together. Every severed bridge reduces the spread, but every lost root slows the orchard’s recovery. Passengers move into fewer compartments as Denise shuts down their air supply. Ruth helps carry a dizzy child down the stairs, then returns to find yellow sap on a terrace they cleared an hour earlier.
The infection has reached the central airway trunk. Its next deep contraction will squeeze contaminated drainage upward through all six terraces. Denise orders the lower orchard abandoned and grips Ruth’s jacket when she refuses to leave. Ruth does not pull away. She leads Denise’s hand to a manufactured collar beneath the trunk: if they detach the lower terraces as one piece and catch them in the drainage basin, the ship can retain its upper foliage without carrying infected roots upward. But the suspended weight will tear through the grating unless someone releases the collars in sequence from below.
Felix climbs down before Ruth can assign him the dangerous end. Then he climbs back one rung and asks her to pass him the wrench.
All three work beneath the orchard while leaves shudder overhead. Denise cuts supporting roots, Ruth seals the exposed ends, and Felix releases the fittings. Rotten-sweet water pours over their boots. At the last collar, the trunk begins to contract early. A hanging terrace twists sideways and pins Felix against a structural rib.
Denise wedges her shoulder beneath the grating to take its weight. Ruth drops beside Felix, but he pushes her pruning hook toward the root wrapped around his trapped boot. Cutting it will drop the terrace before Denise can get clear. Ruth calls for Denise to lower it instead. Together they ease the weight onto Felix’s wrench, bending its handle, and Ruth frees his foot by slicing the boot apart.
They drag him across the basin lip. Denise releases the final collar with both hands. The lower orchard folds into the drainage basin with a heavy, wet crash, and the trunk contracts above it, squeezing clean condensation onto their faces.
For the remaining days to Jupiter transfer, they sleep beside the surviving terraces and wake each other for inspections. Ruth labels every sample, including the first jar, with her own name. Denise does not return her clearance badge. She gives Ruth supervised work and spends her own rest hours beside her, checking each branch before signing it off. Felix limps along the service walk with his ruined wrench tucked into his green pocket.
At the receiving habitat, Ruth’s passage is honored for work completed, though her qualification remains suspended. Before disembarking, she finds Felix at the window he kept cleaning. She asks him to look at Jupiter with her. When he offers his hand, she takes it without inventing a reason. Behind them, the scarred ship draws a slow, clean breath.
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