A dark YA story set in the world of ballet

In this book we meet Laure who is auditioning for her final ballet at her school the Ballet Academy of Paris. It will determine who gets a spot in the the Paris Ballet and their position.A young Etoile Josephine Moreau is brought in to demonstrate the perfect performance. Many rumors swirl around Josephine stories of dark magic and spells. Most believe they are urban legends though Laure does wonder who the young man in the well tailored clothes could be how did Josephine rise so quickly.Are the rumors true or false? How far would Josephine go to reach the top? How far would Laure?A gripping tale of ambition with a touch of horror readers will want to know what happens next.