Chapter 28

Chapter 28 — "Xenonite Breach"

TL;DR: Grace installs a Taumoeba alarm and discovers, with growing horror, that Taumoeba-82.5 has evolved to penetrate xenonite — meaning Rocky's ship, made entirely of xenonite, is doomed.

Summary: Burned by repeated escapes, Grace builds a ship-wide Taumoeba detection grid. It immediately reports a leak from a sealed breeder tank — one whose walls are xenonite. Xenonite was supposed to be impossible to breach; nothing has ever gotten through it. He runs the dish, runs the genetic comparison, and confirms it: a strain of Taumoeba-82.5 has evolved the ability to penetrate xenonite at the molecular level. Adaptation is too good. He freezes. Rocky's ship — its hull, its life-support sphere, its internal walls — is all xenonite, and Rocky is hauling Taumoeba-82.5 home in xenonite canisters. Rocky's ship is, even as Grace stands here, being eaten alive.

Key scenes:

• The new Taumoeba-alarm panel pinging — a single red indicator from a tank that should be hermetic
• A microscope shot of Taumoeba pushing through what looks like a glass wall in slow motion
• Grace's stricken face under helmet light, the math of "Rocky's ship is xenonite" landing
• A graphic of Rocky's vessel with Taumoeba bloom indicators spreading across its hull in imagination

Characters present: Ryland Grace, the AI/Computer; Rocky (referenced in implication)

Locations / settings:

• The Hail Mary lab, a single workbench, a single dish
• Imagined: Rocky's ship, far away, breaching

Visual motifs: a hard red indicator light against pure white instruments, a microscope-rendered breach in a transparent xenonite wall, a horizon-distant ship outline overlaid with creeping breach-marks like spreading gold lichen — a perversion of the cover's motif

Emotional tone: clinical, horrified, math-of-doom, helpless

Confidence: high — the xenonite-evolution discovery is one of the book's biggest plot pivots.