I'll preface this by saying I haven't really read much of this genre before or non-fiction in general outside of academia. I found the central story interesting here, but it just felt padded by so much extra context. The main thread of the crime and Oscar's conviction and everything was interesting, but there was just so much written about that felt only tangentially related. Like maybe the author realized the premise didn't actually offer enough content for a whole book.
But if nothing else this provided some more fun facts for me to break out when relevant.