Golden Quintet: Book 1, The Philosopher's Stone
19 parts Complete Jasmine and Tabitha are both muggle-born witches, both descendants of Rowena Ravenclaw, and both gifted in extraordinary ways.
When Professor Flitwick suddenly shows up at their front door, delivering their letters, the two of them expect to live the next 7 years at Hogwarts in peace. Away from Dorothy's wails, their mum's business deals and most importantly, Aerial.
But as it turns out, their high school bully ends up attending the school too. And she's annoying, very annoying.