In 1978, Philip Parker started his decades-long career as a prison guard at the Kentucky State Penitentiary, a place known as "The Castle" for its medieval look. On his first day, a mass escape set the tone for the dangerous and intense journey ahead. Over the years, Parker faced numerous challenges, from federal court allegations to life-threatening situations, including a dramatic hostage crisis with a notorious inmate.

Parker's memoir takes listeners through the emotions and realities of prison life. From handling daily violence and suicides to witnessing murders caused by racial tension and other conflicts, Parker describes the harsh environment of the prison. Guard includes detailed accounts of harrowing events, like the highway crime spree where two of his colleagues were shot.

The book also covers the evolution of the prison itself, from its early days with medieval punishments to modern-day improvements. Parker shares his experiences as a warden, dealing with staff corruption, inmate violence, and the heavy responsibility of carrying out court-ordered executions.

Guard is a vivid and honest account of a life spent managing the worst in human behavior while finding moments of compassion and redemption. It highlights the dedication and resilience required to maintain order in such a challenging environment, and offers a unique perspective on the sacrifices made by those who work in the prison system.