Dennis C. Rasmussen – The Infidel and the Professor: David Hume, Adam Smith, and the Friendship That Shaped Modern Thought
A highly enjoyable dual biography of David Hume and Adam Smith that mixes the personal and the intellectual. Rasmussen spends too much time on their religious beliefs for my taste, but still gives plenty of attention to more interesting topics. Hume was famously gregarious while Smith was intensely private, though their friendship was a close one. Despite some differences, they were also close intellectual allies who repeatedly defended each other from their many critics.
Hume gets the lion’s share of the book’s attention, mainly because Smith asked that most of his papers be burned after his death. His wishes were mostly respected, leaving less material for the historian to work from.