Geez. "Plagiarize" is a pretty strong word for this. The guy related one small part of a book, and anyone interested will likely check out the book for themselves anyway. The article is practically a rave review of the book. Give the guy a break.
It is a strong word, and I use it deliberately. These sentences were clearly copied from King. If your reader would be better served by a direct quote, then you are not "relating" a part of a book.