That is the new University of Chicago Press volume of Hayek’s collected works, this time volume 15. It is the best single-volume introduction to Hayek’s thought, if you are going to buy or read only one. It has the best of the early essays, as you might find in Individualism and Economic Order, and then the best later essays which build upon those earlier insights.
Here is Bruce Caldwell’s introduction to the volume, for e-purchase. The book’s table of contents is here. Here is our MRU course on Friedrich Hayek.