These are some of my favorites on Audible:
"Extreme Punishment" goes through the details of the conspiracy to murder Dan Markel. It was written a few years ago just before (I think) Charlie's trial, but it sheds a lot of light into the investigation, how the shooters were caught, and the first few trials. It is probably the best summary of the events and investigation that's out there. They had Charlie and Donna dead to rights years ago, in my opinion.
If you want to know about Missouri's own Karen Read style case full of police ineptitude, prosecutorial misconduct, and judge madness, check out "Bone Deep" by Bosworth and Schwartz. Schwartz was the lead defense counsel in the case. I love a good book co-authored by an attorney because it goes into a lot of detail about the trial itself. Once I got into this book I could not stop listening and just binged it for an entire day.
Another book I really like is called "Failure of Justice." It follows a murder investigation which results in a total of six, and you read that correctly, SIX wrongful convictions.