There was a knock on the dungeon door.

“Enter,” said Snape in his usual voice.

The class looked around as the door opened. Professor Karkaroff came in. Everyone watched him as he walked up toward Snape’s desk. He was twisting his finger around his goatee and looking agitated.

“We need to talk,” said Karkaroff abruptly when he had reached Snape. He seemed so determined that nobody should hear what he was saying that he was barely opening his lips; it was as though he were a rather poor ventriloquist. Harry kept his eyes on his ginger roots, listening hard.

“I’ll talk to you after my lesson, Karkaroff,” Snape muttered, but Karkaroff interrupted him.

“I want to talk now, while you can’t slip off, Severus. You’ve been avoiding me.”

“After the lesson,” Snape snapped.

Under the pretext of holding up a measuring cup to see if he’d poured out enough armadillo bile, Harry sneaked a sidelong glance at the pair of them. Karkaroff looked extremely worried, and Snape looked angry.

Karkaroff hovered behind Snape’s desk for the rest of the double period. He seemed intent on preventing Snape from slipping away at the end of class. Keen to hear what Karkaroff wanted to say, Harry deliberately knocked over his bottle of armadillo bile with two minutes to go to the bell, which gave him an excuse to duck down behind his cauldron and mop up while the rest of the class moved noisily toward the door.

“What’s so urgent?” he heard Snape hiss at Karkaroff.

“This,” said Karkaroff, and Harry, peering around the edge of his cauldron, saw Karkaroff pull up the left-hand sleeve of his robe and show Snape something on his inner forearm.

“Well?” said Karkaroff, still making every effort not to move his lips. “Do you see? It’s never been this clear, never since—”

“Put it away!” snarled Snape, his black eyes sweeping the classroom.

“But you must have noticed—” Karkaroff began in an agitated voice.

“We can talk later, Karkaroff!” spat Snape. “Potter! What are you doing?”

“Clearing up my armadillo bile, Professor,” said Harry innocently, straightening up and showing Snape the sodden rag he was holding.

Karkaroff turned on his heel and strode out of the dungeon. He looked both worried and angry. Not wanting to remain alone with an exceptionally angry Snape, Harry threw his books and ingredients back into his bag and left at top speed to tell Ron and Hermione what he had just witnessed.

• • •