'Daniel Houck's intriguing reconsideration of Aquinas's neglected theory of sin is both timely and illuminating. Not only is he able to show the distinctiveness of Aquinas's position, but also its potential for a fresh alignment with contemporary evolutionary theory. Houck is a ready exegete, a clear-thinking philosopher, and an insightful theologian of considerable learning and breadth. This is an outstanding first book from an emerging theological talent.' Sarah Coakley, FBA, Norris-Hulse Professor Emerita, University of Cambridge