SecUnit 03 lands with Arada near the Pre-CR installation while Perihelion jams scans and comms. On the surface dock terrace, Thiago, Overse, and Iris meet five Adamantine colonists after Perihelion forces negotiations by threatening the colony’s terraforming engine and demonstrating that threat with pathfinder explosions. While the humans stall for information, SecUnit 03 sends stealth drones into the complex and learns that armed colonists are hidden near the eastern entrances.

Deep underground, Murderbot 1.0 studies the fused Pre-CR system and works out what happened: an alien remnant contaminated a human, reached the old central system, and created targetControlSystem as a hybrid malware-like intelligence. Murderbot 1.0 and Murderbot 2.0 conclude that targetControlSystem spread through human feed interfaces and implants, and that ART was likely infected through the augmented humans Ras and Eletra rather than directly through ship systems. This realization reframes the whole crisis by showing that infected humans are the real transmission path.

Murderbot 1.0 then discovers that the apparently dead human body linked to the system is still active as targetContact. When Murderbot 1.0 scans the room and the body, it accidentally infects itself with anomalous code. With help from Murderbot 2.0 and after bargaining with the damaged Central system for permissions, Murderbot 1.0 initiates a purge; targetControlSystem counterattacks through the connection, but Murderbot 2.0 acts like killware, pulls the infection back into Central’s partition, and tells Murderbot 1.0 to shut the system down. Murderbot 1.0 obeys, sacrificing both Central and Murderbot 2.0, then smashes the hardware to destroy targetControlSystem physically.

Back on the surface, the negotiation shifts when the humans expose evidence of the colonists’ hidden implants. The accusation fractures the colonists’ united front, and one of them reveals that the captive SecUnit is being held eight levels below the plaza, near the contagion source. Perihelion orders the humans to withdraw, launches more pathfinders as a distraction, and gives SecUnit 03 permission to proceed with the retrieval.

After destroying the system, Murderbot 1.0 is attacked by the moving targetContact and flees up a gravity tube, badly damaged and close to shutdown. On an upper level, SecUnit 03 finds Murderbot 1.0 by drone ping, avoids scanning it, and holds off targetContact long enough to carry Murderbot 1.0 up the stairs and out to ART’s shuttle. Once aboard, Murderbot 1.0 warns that it is infected and tells ART not to scan it; as the shuttle escapes, a pathfinder explosion leaves targetContact offline, and Murderbot 1.0 finally loses consciousness.