"The Darkest Day" by Dennis L. McKiernan is a first edition hardcover book published by Knopf Doubleday Publishing Group in 1984. The book falls under the genre of fantasy/epic literature, written in English. It includes special attributes such as a dust jacket, making it a valuable collectible for fans of literature and fiction. This vintage piece from the United States is a must-have for collectors of antiquarian books and fans of the fantasy genre.