Laura Sebastian’s Ash Princess is a book of elemental magic, fallen royals, and brutal betrayal, about a deposed princess living in exile in her murdered mother’s palace. When her country’s brutal conqueror pushes her too far, she starts laying the groundwork for rebellion, reclaiming her lost power. Sebastian’s trilogy continues this month with Lady Smoke, in which her conflicted heroine, Theo, has both her freedom and a hostage, but must raise an army to save her people. Sebastian is a New York Times bestseller, former Floridian, current New Yorker, and one-time child actor, and we talked to her about worldbuilding, writing fanfic, different kinds of heroines, and plotting Theo’s rise to rebellion.