Platform Decay
Chapter 1 - Torus Arrival, EVA with Three
The mission begins with Murderbot and Three - the Barish-Estranza SecUnit who hacked its governor module in Network Effect - clamped to the exterior of a shuttle like cargo, approaching the torus. The torus is enormous: a ring station that encircles an entire planet, subdivided into zones, each with its own local authorities, ecology, and politics. Barish-Estranza has a presence on the torus and controls some zones directly. Getting inside requires a distraction. Three manages the distraction - Murderbot doesn’t specify what exactly, but it involves a cargo bot doing something very inadvisable - while Murderbot hacks the dock’s access systems and they both slip inside.
The torus’s navigation numbers are engraved into the structural members in Pre-Corporation Rim script. The station is very old. Its internal feed is a dense roar from thousands of commercial, residential, and transit channels all running at once. Murderbot notes it would normally find this overwhelming; it is currently angry, which helps.
The objective: extract a group of people from inside the torus before Barish-Estranza either captures them or kills them. The people include Farai, a member of Mensah’s extended family, and people connected to Leonide - who is already dead, killed in an attack before the extraction begins.
Chapter 2 - Mental Health Module, Ground Transport
Movement through the torus’s commercial zones. Murderbot has installed a mental health module. It notes this as a fact - “I know, I was surprised I did it, too” - without additional explanation. The module runs in the background, tracking and flagging emotional states. Murderbot is not fully convinced this is useful but has not uninstalled it.
Three is learning from Murderbot, which Murderbot finds both useful and uncomfortable. Three has an organized, methodical approach to security that makes Murderbot look improvisational by comparison. Murderbot is improvisational by comparison. Three does not say this out loud. Murderbot respects this.
The ground transport phase of the extraction is underway. Moving through the torus in public requires maintaining the appearance of augmented humans rather than SecUnits, which means weapons concealed, emotional regulators calibrated, movement patterns adjusted to civilian norms.
Chapter 3 - Residential Zones, Three’s Network
Disembarked from the ground transport. Moving on foot through one of the torus’s older residential zones. The zone architecture is layered - the torus’s original structure visible beneath centuries of additions and modifications. Some sections are well-maintained, others are clearly neglected. The zones have different power levels, different local governance, different levels of hostility to outsiders.
Murderbot scouts ahead with drones. The route to the extraction target passes through two more zone borders, each with its own access protocol. Three handles the secondary feed management while Murderbot handles the physical approach. Their working partnership is efficient and mostly silent. Three asks questions when it has them. The questions are good.
Chapter 4 - Leonide in the Kitchen, Intel Exchange
A kitchen. Murderbot walks in and finds Leonide. She is alive in this chapter - the attack that kills her comes later. She lifts an eyebrow when Murderbot enters, expectant, waiting to hear what it wants. Murderbot is there because it has been sent to assess whether Leonide’s information can be trusted and whether helping her is possible.
Leonide is direct. She has children - including a juvenile named Janity - caught in a part of the torus that Barish-Estranza has locked down for an operation she did not authorize and does not fully control. She wants them out. She has information about Barish-Estranza’s internal structure on the torus that would be useful to the Preservation mission. She is prepared to trade.
Murderbot eats Leonide up and down with threat assessment and finds that she is telling the truth, or the parts of it she has chosen to share. It notes that this is probably the best it will get.
Chapter 5 - Data Packet, Extraction Group Expands
Leonide sends Murderbot a data packet. The packet contains maps of the relevant sections of the torus, security protocols, asset locations, and a personnel roster for the B-E team running the locked-down zone. It also contains a code word that will identify Murderbot’s team to Leonide’s children.
Murderbot agrees to include Leonide’s people in the extraction. The group now includes: Farai, Naja (an older woman who uses a mobility device, described by Sofi as her “second mom”), Sofi (a child, Farai’s), and the two juveniles from Leonide’s family, including Janity. This is more people than the original plan assumed. Murderbot starts recalculating routes and capacity.
ART is providing remote coordination - monitoring their feeds, tracking zone transit systems, flagging approaching threats. Not physically present. Very opinionated about Murderbot’s tactical decisions from a safe distance, which Murderbot notes is typical.
Chapter 6 - Naja’s Mobility Device, Group Assembled
Naja’s mobility device is a significant planning factor. It limits which routes are accessible, which transit vehicles they can use, and how fast the group can move in a ground-level emergency. Murderbot maps alternatives. The torus’s older zones have accessibility infrastructure built in - it was a Pre-CR requirement - but decades of deferred maintenance have made some of it unreliable.
The group is now assembled and moving together through one of the residential zones. Naja is competent and does not require assistance; she requires only that the route not be impassable. Farai is quiet and focused. Sofi is managing reasonably well. The juveniles from Leonide’s family are frightened and trying not to show it.
Three distributes a coded feed ping to any SecUnits operating in nearby zones. Murderbot understands, too late, what Three is doing: making contact with other governor-module-hacked SecUnits on the torus, building a network. This is not in the extraction plan.
Chapter 7 - Tourist Zone Cover, B-E Territory Ahead
Going upward - the torus’s zones stack vertically, with different functions at different levels, and the target point requires moving through a section that is currently functioning as a tourist zone. The tourist infrastructure is actually useful cover: lots of foot traffic, lots of commercial feed, no one looking for SecUnits in civilian dress.
The tourist attraction is something the torus’s marketing describes as a geological observation platform with a view of the planet below through a transparent section of the outer hull. The platform gives Murderbot a view of exactly how large the torus is - the curve of it disappearing into the distance in both directions. Three, next to it, watches the same thing and says nothing.
At the end of this zone transit, the next section is B-E territory.
Chapter 8 - Ceiling Ambush, Juveniles Extracted
Murderbot climbs to the ceiling of a transport pod inside the B-E zone. The pod is being used to move people - the hostiles in it don’t know there is a SecUnit on the ceiling. The pod crew, when they discover there is a SecUnit on the ceiling, screams. This is understandable.
Murderbot retrieves the juvenile - Janity - and the other people being held in the pod. The extraction from the B-E zone requires speed: getting everyone out before the pod crew can get a coherent message out, before the zone’s security system registers the disturbance as a SecUnit incursion rather than a standard commercial dispute. Murderbot buys approximately four minutes this way.
Three is waiting with the group at the pre-arranged meeting point. Everyone is now together: Farai, Naja, Sofi, Janity, and the second juvenile.
Chapter 9 - Unaffiliated Zone, Three’s Governor Hack Spreads
The group is in an unaffiliated zone - a section of the torus with no corporate or government authority, just local arrangements and feed access paid for by whoever can afford it. Murderbot understands the appeal. Three has been doing something in the background of the torus’s SecUnit communication protocols, and now the effect is visible: rogue SecUnits are appearing in adjacent zones, their governor module codes matching the hack Three has been distributing. The distribution has gone farther than Murderbot realized - Three has been seeding it for the entire mission.
Murderbot confronts Three about this. Three is unapologetic. It points out that Murderbot’s own governor module has been hacked for years, and that Murderbot has, by its own account, done fine. Murderbot points out that it has also nearly died repeatedly, had multiple psychological crises, and still hasn’t figured out how to be a person. Three seems to weigh this and find it acceptable.
Chapter 10 - Boat Dock, B-E Forces Searching
Moving toward the boat dock. Naja and the others are waiting; Murderbot sends Naja’s drone ahead to establish cover. The torus’s outer zones along this route use water transport extensively - the reservoir system connects multiple transit stations, and the boats are slow but not monitored by B-E. Murderbot sends NajaDrone in advance to hold space and monitor the dock feed.
B-E forces are now actively searching for the extraction group. The locked-down zone operation has apparently escalated, and there is an overlap with an existing conflict between two distributor networks in this section of the torus. Barish-Estranza has entered a three-way conflict it didn’t plan for. Murderbot is not sympathetic.
Chapter 11 - Transit Station Militia, Boarding the Boat
A ground vehicle gets the group to the transit station in just over five minutes. The transit station is being guarded by local militia, who are armed considerably more heavily than expected given the neighborhood. Murderbot runs a fast threat assessment, gets an 89% probability of passage, and walks out of the vehicle with a juvenile held against its chest. The militia parts to let them through immediately.
Inside the lower level of the station, Murderbot finds Naja and Sofi on a bench. Naja has been talking to other travelers and has given away spare transit tickets to people who arrived too late to get slots. The boat is docking. Farai and the juveniles reunite with Sofi. Naja gives Farai a one-armed hug. Murderbot tells Naja the boat is the best option. Naja agrees. They board.
Sofi, half-asleep, tells Naja she’s not allowed to shoot anyone anymore, because second mom said so.
Chapter 12 - Hauler Bot Rampage, Lift Shaft Fight
Back at the transit station on the shore, the situation has escalated visibly. Three more B-E explosive devices detonate in the surrounding area. The armored vehicle that has been providing cover for B-E’s assault team in the station is hit by the hauler bot Murderbot commandeered and set loose - a four-meter industrial hauler that, having run into something once, decides to repeat the experience several times. The armored vehicle’s automated self-defense system fires back at the hauler bot, badly.
Inside the station, Murderbot is managing the second threat: a B-E assault team that has entered through an old maintenance access route connected to a decommissioned lower-level tram platform. The entry point is through a sealed ramp well. Murderbot identifies the entry route from the station schematic, navigates a lift tube shaft (old, dark, smells terrible, has debris piled in it), squeezes through a gap by collapsing its ribcage (then has to put it back), and reaches the old waiting area before the assault team does.
Twenty-two armed humans in light body armor. Murderbot is one SecUnit. The math works out because the assault team doesn’t know where Murderbot is until it is already among them. The group boards the boat with its cargo. The boat leaves the dock.
Chapter 13 - Twenty-Seven Hours, Gun Negotiation, Extract
Twenty-seven-plus hours of travel across the torus toward the outer ring port. The route requires: a boat, a pipe transport, a tram to another transit station, a second pipe transport, a ground vehicle across two unaffiliated zones because neither has mass transit (Murderbot’s feelings about this are forcefully expressed), and finally arrival at the outer ring port.
The first unaffiliated zone is vast storage infrastructure with pop-up habitat clusters and hydroponic gardens. No problems. The second unaffiliated zone has feed warnings of danger. At the border crossing, a human guard tries to sell the group security escorts. Murderbot, Farai, and Naja all request that the gun be given to them for free instead. The guard declines to escalate. They proceed without an escort.
The second unaffiliated zone’s danger level turns out to be real but manageable. Murderbot notes it is absolutely fine. The mental health module disagrees, quietly, in the background. Murderbot ignores it.
At the outer ring port, the shuttle from ART is waiting. Everyone boards. Murderbot lets ART know the extraction is complete. The torus grows smaller behind them.
What This Book Does
Platform Decay is the book in which Murderbot begins to understand what it is teaching Three: not just how to survive outside a governor module, but how to make choices with consequences for other constructs. Three’s distribution of the governor hack across the torus is the largest-scale action any construct in the series has taken, and Murderbot - who did a version of the same thing in the Ganaka Pit incident - is in no position to argue against it on principle. It can only note, with something close to respect, that Three planned it from the beginning and simply didn’t ask permission.
Naja buying fruit from strangers in a dangerous zone, Sofi explaining to a guard that her grandmother is not allowed to shoot people anymore, Farai’s silence on the boat: these are what the extraction is for. Murderbot knows this. It has always known this. It is still learning to act like it does.
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