The first book in Rick Riordan's Egyptian-mythology series opens at the British Museum, where Egyptologist Dr. Julius Kane blows apart the Rosetta Stone in a botched ritual and is sealed into a sarcophagus, unleashing five Egyptian gods on the modern world. Chief among them is Set, lord of chaos, who has his sights set on the Kane family. Fourteen-year-old Carter, who has traveled the globe with his father, and his twelve-year-old sister Sadie, raised in London by their grandparents, have grown up apart and barely know each other. Reunited by catastrophe, they flee with their Uncle Amos and discover they descend from a long line of magicians tied to the House of Life, a secret order dating to the pharaohs. The story is framed as a transcript of an audio recording the siblings made, alternating chapter by chapter between Carter's and Sadie's first-person narration in their distinct voices. To rescue their father and stop Set from destroying North America with a red pyramid, the siblings must master the path of the gods, learn to host the powers of Horus and Isis, and race across continents through magical portals. Riordan blends fast-paced adventure, sibling banter, and a crash course in ancient Egyptian mythology, weaving gods, monsters, and the realm of the Duat into a contemporary quest about family, identity, and inherited power.