What is a summary of The Grey King?

"The Grey King" follows the journey of Will Stanton, an 11-year-old boy living with his aunt and uncle. He stumbles upon a creature named Bran, a powerful Old One, who reveals that Will is the last person in a powerful line of descendants called wardens. These wardens have been tasked with keeping a group of evil beings called the Gray Man from destroying the world.

Bran leads Will to Hibernia, a forest, and tells him about his destiny to confront and defeat the Gray Man. Will initially disbelieves Bran and dismisses the idea of being a warden. However, as the story unfolds, he witnesses signs and encounters that prove his connection to the old legends.

Accompanying Will on his journey are his cousin, Evanlyn, a self-reliant and headstrong girl, and Horace, a loyal forest boy who becomes their devoted friend and protector. Together, they traverse dangerous forests and face challenges that test their courage and friendship.

As Will, Evanlyn, and Horace continue their quest, they encounter allies and enemies along the way. They meet Alyss, a mysterious wanderer with strong magic powers; Halt, a wise and skilled ranger who becomes Will's mentor in archery and survival skills; and Araluen's King Duncan, who provides support and guidance.

Despite their efforts to prevent it, the Gray Man makes his move and begins to wreak havoc. In the climactic battle, Will must draw on his inner strength and accept his role as a warden to confront the Gray Man and his dark forces.

In a battle of light versus darkness, Will discovers the true nature of the Grey King and unveils hidden secrets about his lineage. With the help of his friends, he faces his destiny and fulfills the ancient prophecy that has bound their fates together.