Synopsis

what if Harry Potter had a twin sister no one knew about? someone Voldemort overlooked? What if she's *gasp* slytherin? What if there's a potter adored by Snape? And what if Sirius Black was the one who raised her?

well that's what this story is about.

Warning : I have taken many liberties with the story. As you can see nothing much would really remain the same in the end. Also the characteristics of some characters (* cough* Draco *cough - cough*)may change