This Book Is Free and Yours to Keep presents a captivating collection of letters and artwork by people in prison that highlights the crucial work done by the Appalachian Prison Book Project (APBP), a nonprofit that provides books to incarcerated people in West Virginia, Virginia, Tennessee, Kentucky, Ohio, and Maryland. Through the words of people directly impacted by the criminal punishment system, the collection provides uncommon insight into reading practices and everyday life in prisons and jails while being an inspiration for prison book projects, prison reform, and abolition. Simultaneously communicating the vital importance of access to books and education, and conveying the power of community, the letters sent to APBP by incarcerated people spark conversations about race, poverty, and incarceration and shed light on the movement for accountability for state violence. This Book Is Free and Yours to Keep elucidates the violence and neglect perpetuated by carceral systems and offers a way forward based on solidarity and collaboration.