He realized what it was within seconds. Sirius had given it to him just inside the front door of twelve Grimmauld Place. Use it if you need me, all right? Harry sank down onto 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. 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
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