When Agatha wishes she'd chosen a different Happy Ending, she accidentally reopens the gates to the School for Good and Evil. But when the girls return, they notice that the world they knew has changed. Witches and princesses reside at the School for Girls, where they've been inspired to live a life without princes, while Tedros and the boys are camping in Evil's old towers. A war is brewing between the schools, but can Agatha and Sophie restore peace? Can Sophie stay good with Tedros on the hunt? And whose heart does Agatha's belong to -- her best friend or her prince?