There are a number of great books that you can read that cover some aspect of criminal law. I've read several hundred over the last few years. A lot of fiction, a lot of non-fiction, a lot of academic type books and even a number of biographies.
Here are some suggestions for some of the more academic based criminal law books
Criminal Law (Black Letter Outline)
The Criminal Law Handbook: Know Your Rights, Survive the SystemCriminal Law, 4th Edition (Hornbook Series)Criminal Law and ProcedureCriminal Law: Case Studies and Controversies, 2nd Edition