I always hesitate to bash a book as I know they take hard work to write and are very personal to the writer. But, this is not a good book. While the reader is supposed to draw a clear line between the "good guys" and the "bad guys", the good guys are such awful, miserable people in most regards, that you find yourself ambivalent about the characters from both sides.
For profit schools are execrable and have received a rich castigation in the media that is well-deserved. And yes, in many cases, lawyers aren't great human beings possessed of sterling moral character, nor are big time banks and private investors plumbing every conceivable loophole. But the bad guys here are drawn with such a broad and one-dimensional stroke that I felt a bit insulted as a reader.
So little of what the main characters say or do is plausible, or even possible, that I found myself throwing the book down in disgust on several occasions. I did not want these characters to get away with their crimes and to profit from them in the end. Do yourself a favor and pick up another of Grisham's books. He has numerous good titles out there. This isn't one of them.