The Phoenix Blood

What if Harry Potter had a twin sister? And what if his twin sister wasn't really his twin sister, but was stolen from her real parents after she was born, and given to the Potter's who were told that they were to raise her as Harry's twin? And what if she came into an inheritance and found out the truth about everything?

I don't own characters, or places in this book, just the storyline. All rights go to J.K. Rowling for most characters, the places, and most spells.