I've read all the books in the Pickett series and this like visiting an old friend. We learn about his family, his friends, his dog- even his horse, and his propensity for trashing vehicles. It is who Joe is. He doesn't present a good mystery and pretty much telegraphs the who if not the why. But as Joe says in order to get a suspect to talk "I guess you know why I'm here", and I answer "to visit an old friend".