A word of warning to anyone who would approach Aquinas: read your Aristotle first.
I find Moses Maimonides no more approachable than Thomas Acquinas, but Isadore Twersky's "A Maimonides Reader" is far more approachable than Mary Clark's Acquinas reader.
The author has shown beyond a shadow of a doubt that if Heidegger's critique is accepted, that Aquinas' philosophy does not answer to it. The oblivion of Being in Heidegger's sense is definitely not the oblivion of the act-of-being (esse) in Etienne Gilson's sense. Where the book is very weak, however is in refuting the counterclaim of Lotz that it is Heidegger who has fallen short of Aquinas and not vice-versa. Up to this point, Caputo faces the issues squarely, but here he turns away. Either he seems not to understand the counter-charge, which is difficult to believe after his fine exposition of thomistic metaphysics, or he simply has his heart set on the postmodern path. He cannot seem to muster much more than to fall back on stock terms, such as "radicality" of Heidegger's critique. Yes, radical it is, but true?
Caputo's final effort to discern a Heideggerian mysticism underneath Aquinas' metaphysics really is almost not worth commenting upon. To suggest that Aquinas' mystical experiences involved this kind of gnostic and historicist spirituality is absurd, bordering on the scandalous.
Finally, while the book is generally well balanced in tone, the author sometimes takes up a rather defensive and patronizing posture towards Aquinas when Heidegger's critique is on the rocks.
All in all, I got something out of this book, at least the first half. But it has the weaknesses I mentioned.
In explaining Thomistic philosophy, the book begins where it ought to - with the division of sciences, which naturally turns into a discussion of epistemology. And so on from there.
I think this book is for more advanced students than McInerny's Intros to Aquinas. Every point being made is not confused, but explained very rigorously. As the title of this review states: this is a simplified introduction - not a simplistic one. Lastly, the bibliography at the end of the book is, admittedly, very sparse.