After reading this piece in the Washington Post with the author of the new book about Tom Petty, I think I have to pick up a copy.
The book is written by a member of his former opening act, the Del Fuegos, and Petty specifically insisted that it be a "warts and all" book. So, we learn that Petty was a heroin addict. We learn that he has disgruntled former members of the Heartbreakers. We learn that he grew up in a truly dysfunctional family in Florida.
The article is a great teaser if you're a fan. I personally love the story the author tells about being there the day that George Harrison and Petty were hanging out.