I recommend this book as a tour de force analysis of Kant's moral enterprise and the nature of freedom. It also makes a strong argument for the essentially theistic nature of the human ethical and communal quest for the highest good. It has real, albeit limited, value for the ongoing debate over Kant's classic Religion text.
After teaching at the Universities of London and Cambridge, Christopher Insole took up his post at Durham in 2006, becoming Professor of Philosophical Theology and Ethics in 2013. He has published extensively on realism and anti-realism, religious epistemology, the relationship between theology, metaphysics, and political philosophy, and on the thought of Immanuel Kant. His books include his major study of Kant's philosophy of religion (Oxford, 2013).