Absorbing theology that covers numerous aspects of the Book of Isaiah mostly from a Christian perspective, and does it well. Plenty of history on how the book was perceived as well as biblical interpretation. The unusual perspective of seeing how clergy and laity (including artists and too little, in my opinion, on musicians) have viewed and been inspired by various passages in the book.
Some theological language but on an undergraduate level. If you've taken theology courses or read widely in the area without formal college-level learning, you should be fine with just a few visits to a theological dictionary and encyclopedia, and it's worth the effort.
Recommended for Bible-study students, independent readers of the Bible or scripture studies, and students doing a paper or other project on this book as well as clergy and lay educators wanting more perspective on this book of the Bible that is the source of so many beloved and well-known passages, quotations, and hymns.