I have enjoyed these stories since I was a teenager. They are absolutely worth a read.
It gives its audience a primer on the men of Charles Williams, J.R.R. Tolkien, and C.S. Lewis. It is not absolutely in South but the history portion is just as important as the magic and adventure that these books do take you on.
The story and background of this world grows in this book, expanding on characters and ideas started in other books while also setting up a finale that will leave you wanting more.