The Naughtiest Girl Keeps a Secret by Anne Digby follows Elizabeth Allen, a once-troublesome student at Whyteleafe School who has reformed but still finds herself in tricky situations. When she discovers that her shy new friend Julian has a secret passion for playing the piano, she promises to keep it to herself. However, school gossip, misunderstandings, and a mischievous classmate threaten to expose the secret. The story highlights themes of friendship, trust, and staying true to one’s word.