Here are a few good ones I've read recently:
John Adams and Thomas Jefferson: Friends Divided, by Gordon S. Wood
The Infidel and the Professor: David Hume, Adam Smith, and the Friendship That Shaped Modern Thought, by Dennis C. Rasmussen
Destined for War: Can America and China Escape Thucydides' Trap?, by Graham Allison
The Theory of Moral Sentiments, by Adam Smith (requires more patience and concentration than the others)