¡°We've got it,¡± Fred whispered to Harry. ¡°We've been improving it.¡±
¡°What's under a Dementor's hood?¡±
¡°Harry!¡± said a voice in his right ear. Harry started and looked around at Hermione, who was sitting at the table right behind them and clearing a space in the wall of books that had been hiding her.