Upper Fourth at Malory Towers is the fourth book in the Malory Towers series, first published in 1949. The story follows Darrell Rivers, who is excited to be Head Girl of the Upper Fourth. However, challenges arise as she struggles with leadership, friendships, and her temper, while her younger sister Felicity joins the school and befriends the troublesome June. Blyton masterfully blends school life, personal growth, and adventure in this beloved classic.