Harry knew it was a Disillusionment Charm.
He was only shocked that Darren had used magic during the summer holidays. He would be...
"Oh, brother, Headmaster Dumbledore removed the restriction on my using magic during the summer holidays last year. Don't worry, I'll be right back!"
"No, I'm coming too!"
Harry said hurriedly. He took out the Invisibility Cloak and was about to put it on and leave.
But Hermione and Ron grabbed them both at the same time.
"Take us with you!"
Harry and Darren had no choice.
So Darren could only cast the Disillusionment Charm on Hermione as well. Together, they rushed off in the direction Malfoy had gone. Sure enough—
They followed him to Knockturn Alley.
Then they spotted Malfoy inside Borgin and Burkes.
"What a pity, we can't hear what they're saying... Huh!"
Darren sighed softly.
But he immediately pretended that he had only just noticed the Extendable Ears in Ron's arms.
"You still have those things?"
Only then did Ron remember them too.
He said proudly, "I was planning to put them away, but they got mixed in with my things. Put the Extendable Ears on."
Just then, they heard Malfoy say, "Has that thing been repaired?"
"Not yet... but if you can bring it into my shop..."
"That's none of your concern. Just repair it properly... If you're unwilling, I think my friend Fenrir Greyback will help you understand. And of course, this..."
Malfoy suddenly leaned close to show Borgin something. Harry and the others did not see it before Malfoy put it away again. Darren, however, had seen it.
It was the Dark Mark.
But he pretended not to have noticed.
"Don't tell anyone, understand? That includes my mother!"
Malfoy said coldly at last.
Then he left Knockturn Alley. Harry and the others