Ruth Bader Ginsburg's last book is a curation of her own legacy, tracing the long history of her work for gender equality and a "more perfect Union." In the fall of 2019, Justice Ruth Bader Ginsburg visited the University of California, Berkeley School of Law to deliver the first annual Herma Hill Kay Memorial Lecture in honor of her friend, the late Herma Hill Kay, with whom Ginsburg had coauthored the very first casebook on sex-based discrimination in 1974. Justice, Justice Thou Shalt Pursue is the result of a period of collaboration between Ginsburg and Amanda L. Tyler, a Berkeley Law professor and former Ginsburg law clerk. During Justice Ginsburg's visit to Berkeley, she told her life story in conversation with Tyler. In this collection, the two bring together that conversation and other materials many previously unpublished that share details from Justice Ginsburg's family life and long career. These include notable briefs and oral arguments, some of Ginsburg's last speeches, and her favorite opinions that she wrote as a Supreme Court Justice (many in dissent), along with the statements that she read from the bench in those important cases. Each document was chosen by Ginsburg and Tyler to tell the story of the litigation strategy and optimistic vision that were at the heart of Ginsburg's unwavering commitment to the achievement of "a more perfect Union."