When she had left the room, Professor McGonagall turned back to Harry, Ron, and Hermione.
“What happened when Katie touched the necklace?”
“She rose up in the air,” said Harry, before either Ron or Hermione could speak, “and then began to scream, and collapsed. Professor, can I see Professor Dumbledore, please?”
“The headmaster is away until Monday, Potter,” said Professor McGonagall, looking surprised.
“Away?” Harry repeated angrily.
“Yes, Potter, away!” said Professor McGonagall tartly. “But anything you have to say about this horrible business can be said to me, I’m sure!”
For a split second, Harry hesitated. Professor McGonagall did not invite confidences; Dumbledore, though in many ways more intimidating, still seemed less likely to scorn a theory, however wild. This was a life-and-death matter, though, and no moment to worry about being laughed at.
“I think Draco Malfoy gave Katie that necklace, Professor.”
On one side of him, Ron rubbed his nose in apparent embarrassment; on the other, Hermione shuffled her feet as though quite keen to put a bit of distance between herself and Harry.
“That is a very serious accusation, Potter,” said Professor McGonagall, after a shocked pause. “Do you have any proof?”
“No,” said Harry, “but…” and he told her about following Malfoy to Borgin and Burkes and the conversation they had overheard between him and Mr. Borgin.