Hermione Reveals Rita Skeeter's Secret as an Unregistered Animagus

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During their train ride back to King's Cross, Hermione reveals that Rita Skeeter is an unregistered Animagus who has been transforming into a beetle to spy on people. Hermione caught her and placed her in a jar with an Unbreakable Charm, promising to keep her secret if Rita stops writing lies for a year.