Brimstone continues the Fae & Alchemy series with Saeris Fane newly crowned as queen of the Blood Court, struggling to shoulder a role she never wanted while her magic and circumstances make it impossible for her to safely return home. Forced to send others through the perilous Quicksilver in her stead, she and Kingfisher find themselves separated by duty and distance as political threats, creeping supernatural rot, and dangerous bargains close in on their realm. As Saeris learns what kind of ruler she is willing to become and Kingfisher navigates treacherous city streets and old secrets, their bond is tested by rising stakes, darker magic, and the looming promise that saving their world may demand more than either of them is ready to give.