There are 3 books in the Imperial Radch series. The newest book is Ancillary Mercy which came out in 2015.

Once, she was the Justice of Toren -- a colossal starship with an artificial intelligence linking thousands of soldiers in the service of the Radch, the empire that conquered the galaxy. Now, an act of treachery has ripped it all away, leaving her with one fragile human body, unanswered questions,…
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Ancillary Sword

Book cover of Ancillary Sword
Seeking atonement for past crimes, Breq takes on a mission as captain of a troublesome new crew of Radchai soldiers, in the sequel to Ann Leckie's NYT bestselling, award-winning Ancillary Justice. A must read for fans of Ursula K. Le Guin and James S. A. Corey.

"There are few who…
Breq and her crew must stand against an old and powerful enemy, the Lord of the Radch, and fight for the right to determine their own destinies in the stunning conclusion to the NYT bestselling Imperial Radch trilogy A must read for fans of Ursula K. Le Guin and James…