By Darcy O'Brien; narrated by Perry Daniels. O'Brien was nominated for an Edgar for the text: "The residents of Little Egypt, Illinois, admired Dr. John Dale Cavaness as a medical practitioner and a selfless humanitarian--not knowing he was also a brutal drunkard who murdered his two sons."
This abridged audiobook is three hours of listening on two cassettes*, so if you have a vintage car and an afternoon drive ahead, it's a perfect fit. Will also work as a low-pro stash spot, not that I encourage anything illegal outside of reading about it of course.
* I've got no way to test these at the moment; you're buying as-is, I'm afraid