"The Bitter Kingdom" is the third book in the The Girl of Fire and Thorns series by Rae Carson. It follows the journey of Elisa, a young queen with a powerful destiny, as she navigates political intrigue and personal challenges in a world filled with magic and danger. In this installment, Elisa must confront her enemies and protect her kingdom from threats both external and internal. The story explores themes of leadership, sacrifice, and the complexities of love, as Elisa learns to embrace her role and the responsibilities that come with it.