It is revealed that during the Christmas holidays, Kreacher had interpreted a command of Sirius' as an order to leave the house, and went to Narcissa Malfoy, the wife of Lucius, and told them about Harry and Sirius' close relationship.
Det bliver afsløret, at Kræ i juleferien havde fortolket en besked fra Sirius om at forlade huset, så han kunne tage til Lucius Malfors kone Narcissa Malfoy og fortalte dem om Harry og Sirius' tætte bånd.