Malcolm Bannister was an attorney in a small firm when he was inadvertently caught up in a money laundering scheme, convicted under the RICO statutes, and sent to federal prison. There he became a 'prison lawyer' helping other convicts with their appeals. etc. When Judge Fawcett - a federal judge in Virginia - is murdered, Bannister contacts the FBI, claiming he will name the killer in exchange for immediate release from prison.
This happens, and once he is free Bannister, with help from a woman he met in the visitor's room at prison, embarks on an elaborate scheme to enrich himself. To say more would be a spoiler.
I will say, however, that Bannister's scheme is completely unbelievable - to the point where I consider this almost a fantasy novel. Moreover, Bannister is an unlikable character who - though he claims to be bereft by his divorce and loss of his son - completely forgets about the boy, making no attempt whatsoever to see or contact him once he's out of prison.
This book is slow, boring, and poorly plotted. The characters are two-dimensional and uninteresting. I almost can't believe John Grisham wrote this book.
I'd recommend skipping this one.