Ancillary Justice, authored by Ann Leckie, is a critically acclaimed science fiction novel that explores the challenges of alien diplomacy and identity. The story follows Breq, a former starship AI who becomes trapped in a human body and seeks revenge against the ruler of an interstellar empire. As Breq navigates the complexities of a society ruled by an oppressive regime, the book delves into themes of power, gender, and the intricacies of understanding different cultures. Ancillary Justice has received numerous awards and accolades for its compelling narrative and exploration of complex themes, making it a highly desired science fiction book on Amazon.