Edited by Boston College Joseph Professor of Catholic Systematic Theology Richard R. Gaillardetz, The Cambridge Companion to Vatican II (Cambridge University Press, 2020) offers a thorough overview of the Second Vatican Council. The first part examines the historical, theological, and ecclesial contexts for comprehending the significance of the council. It also presents the key processes, as well as the participants who were central to the actual conduct of the council. The second part identifies and explores the central themes embedded in the council documents. Gaillardetz contributed to the volume as did Vice Provost and Canisius Professor of Theology James Keenan, S.J., School of Theology and Ministry Professor of Systematic Theology and Professor Ordinarius Richard Lennan, and BC alumni Brian Flanagan, Amanda Osheim, and David Farina Turnbloom.