Although it's far from an Orthodox book, The Closing of the American Mind by Alan Bloom.
One of the more overrated books of the last century. Every now and then he's right in his criticism of the ideas of his opponents, although he overstates the importance that relativism holds in the minds of his opponents. His own ideas, though, are not much better either. His strict universalism, for example, is in many cases as bizarre as the relativism he so consistently critizes, and despite taking issue with the relativists much of his ideas about literature come from Nietzsche. He also has the tendency to see western philosophy and literature before the 20th century as a continuous and harmonious whole, which, of course, it wasn't.
He is often unable to avoid sounding like a ranting old man, complaining on how x, y and z were so much better in his days, which makes the book hard to enjoy. All arguments of merit in his book has been said better elsewhere, and those that are new are bizarre and often contradicted by the author without himself noting it.