The dormitory door opened.
¡°Well?¡± said Snape again. ¡°This parchment is plainly full of Dark Magic. This is supposed to be your area of expertise, Lupin. Where do you imagine Potter got such a thing?¡±
¡°Where's Professor Lupin?¡± he said.
Harry bit his lip. He didn't know what had happened and didn't want to admit it ¡ª but Snape seemed to have guessed the truth.