Zodiac Academy 7: Heartless Sky by Caroline Peckham

In this installment, the stakes are higher than ever for Darcy and Tory Vega. With the power struggles at Zodiac Academy reaching a boiling point, the twins face their greatest challenge yet as they try to consolidate their claim to the throne. The sky over Solaria is darkening with threats, and the sisters must confront not only their fiercest enemies but also the deep-seated betrayals within their own ranks. As they navigate a web of deception, power, and shifting alliances, Darcy and Tory must unlock new levels of their powers and unravel the mysteries that surround their pasts. Their journey is marked by epic battles, emotional confrontations, and the constant struggle to maintain their humanity amidst the chaos.