This book argues that Ann Leckie's novel Ancillary Justice offers a devastating rebuke to the political, social, cultural, and economic injustices of American imperialism in the post 9/11 era. Following an introductory overview, the study offers four chapters that examine key themes central to the novel: gender, imperial economics, race, and revolutionary agency. Ancillary Justice's exploration of these four themes, and the way it reveals how these issues are all fundamentally entangled with the problem of contemporary imperial power, warrants its status as a canonical work of science fiction for the twenty-first century. The book concludes with a brief interview with Leckie herself touching on each of the topics examined during the preceding chapters.