The Well at the World's End tells the story of Peter, King of Upmeads, and his four sons, Blaise, Hugh, Gregory, and Ralph. These four sons decide one day that they would like to explore the world, so their father gives them permission, except for Ralph, who is to remain at home to ensure at least one living heir. Ralph, however, secretly departs contrary to his father's orders and begins his explorations at Bourton Abbas, after which he goes through the Wood Perilous. During his explorations Ralph learns about the Well at the World's End and so begins the quest that will lead him into numerous adventures and misadventures.