Their last evening at school arrived; most people had finished packing and were already heading down to the end-of-term leaving feast, but Harry had not even started.
“Just do it tomorrow!” said Ron, who was waiting by the door of their dormitory. “Come on, I’m starving.”
“I won’t be long… look, you go ahead…”
But when the dormitory door closed behind Ron, Harry made no effort to speed up his packing. The very last thing he wanted to do was to attend the Leaving Feast. He was worried that Dumbledore would make some reference to him in his speech. He was sure to mention Voldemort’s return; he had talked to them about it last year, after all…
Harry pulled some crumpled robes out of the very bottom of his trunk to make way for folded ones and, as he did so, noticed a badly wrapped package lying in a corner of it. He could not think what it was doing there. He bent down, pulled it out from underneath his trainers and examined it.
He realised what it was within seconds. Sirius had given it to him just inside the front door of number twelve Grimmauld Place. “Use it if you need me, all right?”
Harry sank down on to his bed and unwrapped the package. Out fell a small, square mirror. It looked old; it was certainly dirty. Harry held it up to his face and saw his own reflection looking back at him.
He turned the mirror over. There on the reverse side was a scribbled note from Sirius.
...
This is a two-way mirror, I’ve got the other one of the pair. If you need to speak to me, just say my name into it; you’ll appear in my mirror and I’ll be able to talk in yours. James and I used to use them when we were in separate detentions.
Harry’s heart began to race. He remembered seeing his dead parents in the Mirror of Erised four years ago. He was going to be able to talk to Sirius again, right now, he knew it—
He looked around to make sure there was nobody else there; the dormitory was quite empty. He looked back at the mirror, raised it in front of his face with trembling hands and said, loudly and clearly, “Sirius.”
His breath misted the surface of the glass. He held the mirror even closer, excitement flooding through him, but the eyes blinking back at him through the fog were definitely his own.
He wiped the mirror clear again and said, so that every syllable rang clearly through the room:
“Sirius Black!”
Nothing happened. The frustrated face looking back out of the mirror was still, definitely, his own…
Sirius didn’t have his mirror on him when he went through the archway, said a small voice in Harry’s head. That’s why it’s not working…
Harry remained quite still for a moment, then hurled the mirror back into the trunk where it shattered. He had been convinced, for a whole, shining minute, that he was going to see Sirius, talk to him again…