小柔就讀的學校裏一名家境富裕的中二女生周曼曼從二十一樓寓所墮下死亡， 警方在死者家裏找到遺書，遺書說她因學業問題尋死，故列作自殺案處理。
兩天後，小柔在學校的儲物櫃裏發現一封匿名信，信內說周曼曼並非自殺，而是他殺，並列出種種疑點：一，她在校曾被欺凌；二，有人對她追求不遂，懷恨在心......真相，究竟是什麼？張小柔化身少女偵探出動！所有謎底將會一一解開！
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