The Galaxy, and the Ground Within recap

Gora is a barren planet whose only value is its position between wormhole tunnels, and the Five-Hop One-Stop is a small waypoint on its surface run by Ouloo, a Laru, and her adolescent child Tupo. Three travellers put down there within hours of each other: Pei, an Aeluon cargo captain hauling for her people's war; Roveg, a Quelin exile racing to an appointment he has waited years for; and Speaker, an Akarak who cannot breathe the atmosphere everyone else shares and lives in a mech suit. Then Gora's orbital infrastructure fails in a cascade of satellite collisions, cutting communications and grounding every ship for days. Stuck together, the strangers argue and confide, weather Tupo being badly poisoned with no medical help to call, and mount a rescue when Speaker's shuttle is struck by falling debris. When the sky clears they leave changed: Roveg gets a brief supervised contact with the sons he was exiled from, Pei resolves to decide her own future, Speaker returns to her sister, and Ouloo builds a room at the waypoint with Akarak-breathable air so the next traveller like Speaker has somewhere to be.

These books share a setting rather than a story, and this one can be read on its own. The Galactic Commons is a multi-species interstellar civilisation whose members travel through a network of punched wormhole tunnels; the ordinary business of that network is freight, and freight needs waypoints to wait at. One character carries over from the first book: Pei, an Aeluon cargo captain, who has for years kept a private relationship with a human ship's captain, something Aeluon custom would not tolerate if it became known. Nothing else from the earlier books is needed here, and none of the other characters have appeared before.

Gora is a barren, resourceless planet whose only value is its position: it sits between several wormhole tunnels, so ships crossing the Commons put down there to wait for their departure windows. The Five-Hop One-Stop is a small independent waypoint on its surface, run by Ouloo, a Laru who has built it up over years, and her adolescent child Tupo, who helps under protest and is curious about everything. Three ships land within hours of each other. Pei is an Aeluon cargo captain running supplies for her people's ongoing war. Roveg is a Quelin exile who designs immersive sims and is travelling to an appointment he has waited a long time for. Speaker is an Akarak, one of a species with no homeworld and no standing in the Commons, who cannot breathe the atmosphere everyone else shares and so moves around in a small mech suit; her twin sister Tracker stays aboard their ship in orbit. While all three are on the ground, Gora's orbital infrastructure fails in a cascade of satellite collisions, knocking out communications and traffic control and grounding every ship on the planet indefinitely.

With no way to leave and no way to call out, the guests are thrown together in Ouloo's garden dome and dining room. Ouloo responds by feeding people and organising activities; Tupo attaches xyrself to the visitors. The conversation ranges over the awkward practicalities of being different species in one room - what each of them can eat, what each considers polite, what their peoples have done to each other. Speaker is direct about the Akaraks' position: a species stripped of its world by Harmagian expansion, refused the resources that would make Commons membership possible, and generally assumed to be thieves. Roveg is open about being an exile whose shell carries the mark of his conviction, though not yet about what he made or where he is going. Pei says little about her cargo or her private life, both of which are complicated.

The delay stretches and tempers fray. Tupo, sampling the guests' food supplies out of pure curiosity, is badly poisoned, and with communications down there is no medical help to call: Ouloo and the guests have to treat xyr themselves and sit out the worst of it. The crisis pushes the group past politeness, and the conversations afterwards are more honest. Roveg explains that he was exiled for making art that criticised Quelin society, and that the appointment he is racing toward is a hearing that may let him make contact with the sons he has not been allowed to speak to. Speaker and Pei argue about the war Pei's cargo supports and about whom the Commons actually protects. Ouloo, who has never left Gora, takes all of it in.

Speaker flies up to check on Tracker aboard their ship and is caught by debris falling out of the collapsing satellite network. Her shuttle is disabled and her suit's air supply compromised, and she cannot survive long in an atmosphere she is unable to breathe. The others go after her, improvising a rescue out of what the waypoint and their own ships can supply, and bring her back alive. It costs them their reserves and any remaining pretence that they are only strangers waiting out a delay together.

In the days after the rescue the group settles into something like trust. Pei works through what she actually wants: whether to have the child her biology and her people are pushing her toward, and what to do about a relationship her culture would never accept. Roveg and Speaker, whose peoples sit on opposite sides of an old colonial history, reach a genuine understanding. Ouloo confronts how narrow her own life on Gora has been and how carefully she has taught Tupo to keep xyr head down. Tupo recovers and begins thinking seriously about what xe wants to become. Orbit is gradually cleared and traffic control comes back online.

The ships are cleared to leave and the four travellers scatter. Roveg reaches his hearing and is granted a brief, tightly supervised contact with his sons, which he takes on any terms offered. Pei leaves Gora determined to decide for herself about children and about the human she loves, instead of accepting the decisions her people would make for her. Speaker and Tracker go back to their work, carrying the memory of having been treated as guests rather than as a nuisance. Ouloo, using what she learned from having an Akarak stranded on her doorstep with nowhere to take off her suit, builds a room at the Five-Hop with Akarak-compatible air, so that the next traveller like Speaker has somewhere to breathe. No war ends and no politics are fixed; what changes is what these five people do next.

Orbit is eventually cleared, traffic control comes back, and the four travellers go their separate ways. Roveg reaches the hearing he was racing toward and is granted a brief, tightly supervised contact with the sons he was exiled away from, which he accepts on whatever terms are offered. Pei leaves Gora resolved to make her own decisions about whether to have a child and about the human she loves, rather than let her people's expectations make them for her. Speaker and Tracker return to their work, having spent three days being treated as guests rather than as a problem. Ouloo, who watched an Akarak be stranded on her doorstep with nowhere to take off her suit, builds a room at the Five-Hop with Akarak-compatible air so the next traveller like Speaker has somewhere to breathe; Tupo, recovered and older, is starting to work out what xe wants to be. Nothing large is resolved by any of it: the Aeluon war continues, the Quelin remain what they are, and the Commons has still done nothing for the Akaraks. What the book ends with is smaller and deliberate - a handful of strangers who were decent to each other while stuck, and who changed how they act afterwards.