If you're interested at all by interpretation of the law, Gideon's Trumpet is a very good read. The author provides background information, explains certain pertinent legal terms, and logically lays out the story of not only this one title case, but the very workings of the United States Supreme Court circa 1963. Several times I found myself laughing and at other times being logically challenged. It is a great, entertaining book for law students and non-lawyers alike.
This book does a good job of explaining complex legal concepts to laypeople. If you're a lawyer, it's less interesting because much of the book is like a simplified version of a Fed Courts class (stuff you already know).
What a fascinating look at a sliver of the justice system -- one case, and how it was processed through the Supreme Court. These days we can't imagine that a person could be sent to prison for years without the benefit of legal council, if he couldn't afford it. This is the case that changed all that -- and not all that long ago, either.