I couldn't help but wonder if the author, Michael Finkel, used the story of Christopher Knight for his own personal gain. He spends quite a few paragraphs in the opening chapters trying to convince the reader otherwise, that he had a natural understanding of Christopher, and that he was just helping out this stranger out of the goodness of his own heart. I'm skeptical, I think he saw a bestseller in the making and, of the people trying to profit from this story, played the game the best. He admits he needed to redeem his career after making some mistakes.
I don't necessarily have a problem with seeking out a good story and bringing it to the world, but don't try to sugar coat it as if you only had Christopher Knight's interest in mind. I didn't buy into that.
It is an interesting story, though.