The Throne of Fire is the second book in The Kane Chronicles series by Rick Riordan. It continues the adventures of Carter and Sadie Kane, young magicians and descendants of the ancient pharaohs, as they battle against powerful Egyptian gods and forces of chaos. In this installment, Carter and Sadie are racing against time to find the Book of Ra and awaken the sun god, Ra, before Apophis, the god of chaos, rises and plunges the world into destruction. Their journey takes them across the globe, from Brooklyn to Russia to Egypt, as they decipher ancient texts, battle terrifying creatures, and recruit new allies to their cause. Along the way, they face betrayal, powerful enemies, and their own growing magical abilities. With a blend of humor, action, and mythology, The Throne of Fire expands the magical world of the Kane siblings while setting the stage for an epic final battle in the series.