Hahn, a former Presbyterian minister turned Catholic convert and author, does a great job of discussing covenants and how they relate to Sacraments, which I think is beneficial for anyone, Catholic or not, who wants to understand the Catholic thought on this a bit more. After going through the covenantal history, he looks at the various Sacraments individually, devoting the most time to the Eucharist, of course, since that is such a fundamental part of Catholic faith. As I mentioned, I think this book is good for Catholics and non-Catholics alike. Catholics may find a greater understanding of the Sacraments and how they affect us, and non-Catholics may understand more how Catholics view the Sacraments, which can facilitate discussion, since Catholics and Protestants often have very different understandings of the Sacraments. I'd certainly recommend this book, though.