"The Grey King" is the fourth book in the Dark is Rising series by Susan Cooper. It follows the story of a young boy named Will Stanton as he embarks on a quest to find the lost signs of power needed to combat the forces of darkness. Set in Wales, the narrative blends elements of folklore and mythology, highlighting the struggle between good and evil. In this installment, Will encounters the mysterious Grey King, a figure who plays a crucial role in his journey. The story explores themes of friendship, bravery, and the importance of heritage, while also emphasizing the connection between nature and the supernatural.