Ministry: Lay Ministry in the Roman Catholic Church: Its History and Theology, by Kenan Osborne, is a comprehensive study exploring the vital, often overlooked, role of non-ordained members (the laity) in the Church, tracing its biblical roots, historical development, and theological foundations, arguing for the full participation of all baptized Christians in Jesus's mission, beyond just clerical roles, to understand true discipleship. It examines the ebb and flow of lay involvement, contrasting historical prominence with later diminishment, and culminates in a vision for the integrated, essential ministry of lay people today, serving as a vital resource for both laity and clergy. In essence, the book argues that understanding lay ministry is crucial for grasping the true nature of the Church, moving beyond a clerical-centric view to embrace a more complete picture of shared mission and discipleship rooted in Christ.