Macy's book is very well documented. The references are extensive & many of the sources are primary e.g. interviews with addicts, family members, texts, etc. The book is over 500 pp. Really its two books in one. The first is the story about Purdue Pharma - this is excellent. The 2nd part digs deep into personal experience of heroin addicts and dealers living along the I-81 corridor from Roanake to Baltimore. I found this part tedious and way too descriptive.