"Well, there you are," Harry said quietly, "Snape's already got past Fluffy."

Seeing the open door somehow seemed to impress upon all three of them what was facing them.

Underneath the cloak, Harry turned to the other two. "If you want to go back, I won't blame you," he said. "You can take the cloak, I won't need it now."

"Don't be stupid," said Ron.

"We're coming," said Hermione.

Harry pushed the door open.

As the door creaked, low, rumbling growls met their ears. All three of the dog's noses sniffed madly in their direction, even though it couldn't see them.

"What's that at its feet?" Hermione whispered.

"Looks like a harp," said Ron. "Snape must have left it there."

"It must wake up the moment you stop playing," said Harry. "Well, here goes..."

He put Hagrid's flute to his lips and blew. It wasn't really a tune, but from the first note the beast's eyes began to droop. Harry hardly drew breath. Slowly, the dog's growls ceased — it tottered on its paws and fell to its knees, then it slumped to the ground, fast asleep.

"Keep playing," Ron warned Harry as they slipped out of the cloak and crept toward the trapdoor. They could feel the dog's hot, smelly breath as they approached the giant heads.

"I think we'll be able to pull the door open," said Ron, peering over the dog's back. "Want to go first, Hermione?"

"No, I don't!"

"All right." Ron gritted his teeth and stepped carefully over the dog's legs. He bent and pulled the ring of the trapdoor, which swung up and open.

"What can you see?" Hermione said anxiously.

"Nothing — just black — there's no way of climbing down, we'll just have to drop."