Ancillary Sword picks up almost immediately after Ancillary Justice ends. Breq, kind of forcibly adopted into the house of tyrant Anander Mianaai, is sent by said tyrant to Athoek Station. Anander wants Breq to look for signs of the other Anander’s influence in the system; Breq just wants to protect the surviving family member of a lieutenant she once knew when she was Justice of Toren.
The specifics aren’t really important here, and you…