I was first introduced to this book through Lighthouse Catholic Media; Scott Hahn gives a talk on CD, with the same title, overviewing this book.
I still remember the moment I pulled into my high school parking lot just as this CD was finished. I sat there stunned. I had been poorly catechized and I had no idea that there was so much depth to Catholic theology. Most of what I had heard or read up until that point was not very substantial. This lit a fire in me that has never gone out since I This is also when I first knew, in an much more intimate way than before, that the faith is REAL.
I went on to read the book and appreciated all the extra detail, but nothing can replace hearing Dr. Hahn's passionate voice. I recommend starting with the CD and then reading the book. You'll remember the work better as well.