Eleanor Estes's short novel tells the story of Wanda Petronski, a Polish immigrant girl who wears the same faded blue dress to school every day but claims to have a hundred dresses at home—all lined up in her closet. Her classmates, led by popular Peggy and her friend Maddie, tease Wanda relentlessly, asking her to describe these dresses in detail. Maddie feels uncomfortable with the game but lacks the courage to stop it. When Wanda's family moves away, she leaves behind something that forces her classmates to see their cruelty clearly. Estes, who based the story on a childhood memory of witnessing bullying, writes with restraint that makes the emotional impact more powerful. The narrative focusses on Maddie rather than Wanda, examining how bystanders enable cruelty through silence and how guilt operates once the damage is done. Louis Slobodkin's illustrations capture both the beauty of what Wanda created and the grimness of her daily humiliation. The book has been used for decades to spark classroom discussions about bullying, though its literary qualities transcend its pedagogical usefulness. Estes shows rather than tells, trusting readers to understand what she does not explain. Young readers encounter questions about courage, conformity, and what we owe each other; adults returning to the book find its spare precision even more impressive than they remembered.