I haven't read Finkel's book on Christopher Knight, but other pieces on Knight were discussed here, with distinct tones to the discussions.
Into the woods: how one man survived alone in the wilderness for 27 years - https://news.ycombinator.com/item?id=13878801 - March 2017 (124 comments)
The Strange and Curious Tale of the Last True Hermit - https://news.ycombinator.com/item?id=8205993 - August 2014 (86 comments)