Middle books sag. Ancillary Sword does the opposite: it narrows on purpose. One ship, one station, one planetary system, while the galactic civil war the first book detonated happens almost entirely offstage. What is left is the question the first book could not ask: what does Breq’s obsession with justice actually cost once she has power instead of a grievance?
The reading desk’s verdict: it is a colonial-administration novel wearing a space-opera uniform, and better for it. The plot is Breq working down through a system’s layers of comfortable, legalized exploitation until she hits the crime underneath. Nothing explodes for two hundred pages and the tension never drops, which is its own kind of craft.
Structurally it solves a problem the first book invented. With the narrator wired into her ship’s feeds, a one-bodied character still experiences the world like a distributed being, so the single timeline reads multi-threaded. The vault dossier goes deeper; the card version is simply: the rare sequel that chose depth over scale and won the bet.