Harry, Ron, and Hermione didn't speak to each other at all until they came to a halt in the entrance hall, which seemed very cold and gloomy after the grounds.

"We've got to go to Dumbledore," said Harry. "Hagrid told that stranger how to get past Fluffy, and it was either Snape or Voldemort under that cloak — it must've been easy, once he'd got Hagrid drunk. I just hope Dumbledore believes us. Firenze might back us up if Bane doesn't stop him. Where's Dumbledore's office?"

They looked around, as if hoping to see a sign pointing them in the right direction. They had never been told where Dumbledore lived, nor did they know anyone who had been sent to see him.

"We'll just have to —" Harry began, but a voice suddenly rang across the hall.

"What are you three doing inside?"

It was Professor McGonagall, carrying a large pile of books.

"We want to see Professor Dumbledore," said Hermione, rather bravely, Harry and Ron thought.

"See Professor Dumbledore?" Professor McGonagall repeated, as though this was a very fishy thing to want to do. "Why?"

Harry swallowed — now what? "It's sort of secret," he said, but he wished at once he hadn't, because Professor McGonagall's nostrils flared.

"Professor Dumbledore left ten minutes ago," she said coldly. "He received an urgent owl from the Ministry of Magic and flew off for London at once."