The previous reviewer seems to misunderstand this book and the series to which it belongs. The series provides classic texts with commentaries by scholars who are expert in the field. Adriaan Peperzak is certainly one of the best Levinas scholars around, and this book gives us a good introduction to, and superb commentary on, Levinas' essay, "Philosophy and the Idea of Infinity".
Having said that, it is certainly true that this book is not the place to start if you are approaching Levinas for the first time. In that case, the best place to start is the collection of Philippe Nemo's interviews with Levinas, gathered under the title "Ethics and Infinity." This is quite accessible to the educated reader. This might then be followed up with Colin Davis' genuinely introductory book on Levinas.
After some such background, then the reader should be ready to take up Peperzak's commentary here. At this stage it is very good to have a guide like Peperzak to lead you through the difficult nuances and reference points of so complex a thinker as Levinas. "Philosophy and the Idea of Infinity" is a kind of summary of Levinas' philosophy, but it is not easy going. Peperzak helps you see what you would have missed on your own.
I highly recommend this book, as well as the series as a whole. Levinas is a difficult, but very rewarding thinker--one of those who has the power to change your whole outlook on life.