Hoarding is a term we hear more and more. Understanding this condition is key in helping people. So, if you know someone who hoards or you just want to know a bit more about it then consider this book from a fellow member of APDO (Association of Professional Declutterers and Organisers).
https://www.amazon.co.uk/Understanding-Hoarding-Jo-Cooke/dp/1847094538/ref=asap_bc?ie=UTF8
Hoarding – understanding is required