Ancillary Mercy

Ancillary Mercy by Ann Leckie,  330 pages.
The final book in Leckie's excellent, excellent "Imperial Radch" series. Fleet Captain Breq, commander of the Mercy of Kalr, and former Ancillary for the AI of the much larger Justice of Toren, must decide how to face the imminent attack by one aspect of Anaander Mianaai, Lord of the Radch. Since Anaander has apparently been at war with herself (she has taken over so many bodies, Ancillary-style over the centuries, and can no longer agree with herself about certain key issues) for some time, Brecq has to decide which, if any of the Anaanders she can serve. Complicating the situation is the dead emissary from the Presger Empire, the newly arriving Presger representative, and Sphene, the representative of a ship that disappeared centuries ago. Characters become even more important as several of the ships, including Kalr, and the Athoek station make their wishes known.
A wonderful conclusion to a great trilogy.