Harry Potter and the Montague Lady

Harry Potter was an ordinary boy of 12. Well apart from the fact he was a boy who defeated the Dark Lord twice in his lifetime, was a wizard and had a scar the shape of lighting that hurt whenever the said Dark Lord was near, he was perfectly normal. What he didn't tell anyone at Hogwarts was the fact that he had a soul-sister named Artemis. And Artemis is what this book is about.