The Secret Lives of Hoarders is a great overview of hoarding. You may already be familiar with the author, Matt Paxton, if you watch the A&E TV show Hoarders since his company is one of the ones the show uses to help clean out the houses of hoarders. Paxton is definitely writing this book from the perspective of all the hoarders he has personally helped, but he also understands addiction as well since he explains that he used to have a gambling addiction that caused him to have to start over. He explores a lot of the basic parts of hoarding - what is it, reasons people hoard, how to plan a clean-up, how to implement the clean-up plan, and how to help hoarders stay clean. He also gives lists of resources for hoarders or friends and family of hoarders. I also liked that at the end of the book he gives follow up information on all the hoarders he used as examples throughout the book, so you know if they kept things up or fell back into their old ways. Overall, a great book if you're interested in this topic.