Harry Potter and The Last Slytherin

Harry finds a baby girl abandoned in the ruins of a Death Eater safe house, a letter left behind her. Startled by history repeating itself, he and Ginny take the child in as their own. But what will happen when her legacy begins catching up to her? During her fifth year at Hogwarts she's experiencing mortifying surges towards the Dark Arts, a reminiscent gift from her true parents.