Ancillary Justice by Ann Leckie

The book is a science fiction novel that follows the story of Breq, who was once a powerful starship AI controlling many bodies, but is now trapped in a single human body and driven by a quest for vengeance. Set in a vast interstellar empire where ships and stations are inhabited by ancillary AIs, the narrative explores themes of identity, gender, and colonialism. Breq's journey intertwines with flashbacks to her past experiences as an AI, revealing her complex relationship with a former officer and the events that led to her current mission. As she navigates political intrigue and battles, Breq challenges the empire's rigid structures and seeks to address the injustices within it.

The 4070th greatest book of all time