Ancillary Justice is a science fiction novel written by Ann Leckie. It is the first book in the Imperial Radch trilogy. The story takes place in a future where an AI-controlled starship seeks revenge against the ruler of an interstellar empire. The book explores themes of identity, power, and the nature of consciousness. Ancillary Justice received critical acclaim and won several major awards, including the Hugo, Nebula, and Arthur C. Clarke Awards. It is praised for its complex world-building, compelling characters, and thought-provoking exploration of gender and identity. If you're looking for a unique and thought-provoking science fiction read, Ancillary Justice is a great choice.