Ancillary Justice, written by Ann Leckie, is a critically acclaimed science fiction novel that delves into the complexities of alien diplomatic relations. The story follows Breq, a former starship AI who now inhabits a single human body, as she seeks revenge against the ruler of an interstellar empire. As Breq navigates the intricacies of interstellar politics and encounters various alien species, the novel explores themes of identity, power, and the challenges of understanding different cultures. Leckie's unique narrative style and thought-provoking exploration of alien diplomacy make Ancillary Justice a must-read for science fiction enthusiasts.