A World Without Princes by Soman Chainani

After saving themselves and their fellow students from a life pitched against one another, Sophie and Agatha are back home again, living happily ever after. But life isn’t exactly a fairytale. When Agatha secretly wishes she’d chosen a different happy ending with Prince Tedros, the gates to the School for Good and Evil open once again. But Good and Evil are no longer enemies and Princes and Princesses may not be what they seem, as new bonds form and old ones shatter.