Furbank seems to have discovered what he wanted to say about Diderot quite near the end of the book. Up to that point I thought that the author had merely typed out note cards that he had sequenced as one would sequence information in a biography - in roughly chronological order. Near the end I could discern Furbank's take on Diderot. So it seems that the book actually documents Furbank's process of learning and discovery of what he wished to say about his subject - acceptable, I suppose, in a first draft, but not in a completed manuscript. His biography would have been much more effective and engaging had he first developed his perspectives/themes and then allowed those judgements to guide his writing from the beginning of the book.