Carter Kane and his sister must prevent the chaos snake Apophis from breaking free in a few days' time or the world will come to an end. To have any chance of battling these Forces of Chaos, the Kanes must revive the sun god Ra.

Sixteen-year-old Isadora, the mortal daughter of Isis and Osiris, is sick of being in the middle of family drama so she jumps at the chance to leave Egypt and start a new life in San Diego with her brother.