A girl from the forest arrives in a bustling kingdom with no name and no idea why she is there, and finds herself in a world at war. She enlists at Pennyroyal Academy, where princesses and knights prepare to battle witches and dragons. Given the name "Evie," she endures a harsh training regimen and learns what it truly means to be a princess - realizing surprising things about herself and her family, about human compassion and inhuman cruelty. And with the witch forces moving nearer, she discovers that the war between princesses and witches is much more personal than she could ever have imagined.