"The High King" is a fantasy novel written by Susan Cooper, published in 1965. It is the fifth book in the The Dark is Rising Sequence, a series that blends elements of Arthurian legend with modern fantasy. The story follows a young boy named Will Stanton as he discovers his role in the battle between Light and Dark. The plot centers around the quest for the High King, who must unite the forces of Light to combat the rising power of the Dark. The narrative explores themes of bravery, friendship, and the struggle between good and evil, making it a compelling read for both children and adults.