The Secret of the Sand Castle

Set across thirty-eight volumes from 1932 to 1967, the Judy Bolton series stands out for its engaging plots and realistic portrayal of characters who grow and face significant social issues. Unlike typical series protagonists, Judy and her friends evolve, tackling important themes while embodying qualities of a strong role model. Celebrated for its feminist undertones, the series presents Judy as smart, capable, and courageous, making it one of the most successful and enduring girls' series in literature.