Empress of the Sun begins when the airship Everness is about to crash after going through a Heisenburg jump. Everett Singh, a talented mathematician, feels responsible for crashing the Everness in an unknown universe because of his calculations for the Heisenburg jump between realities. The Everness's crew soon discovers that they have crash landed on a "Diskworld," which is inhabited by an extremely advanced race of dinosaurs called the Jiju. On the Diskworld, the asteroid that killed the dinosaurs on other parallel earths never hit, so they got a huge head start on evolution. The first Jiju that Everett meets is Kax, a member of the Sunlords, who control the sun. The Everness's crew plans on leaving as soon as they fix their airship, but will the Jiju let them? Meanwhile, Charlotte Villiers is trying to get the Infundibulum, which has codes for every parallel universe, from Everett Singh. Charlotte Villiers has forced Everett M to take Everett Singh's place on Earth 10, Everett Singh's home planet, because she sent Everett Singh out of his universe's dimension. Singh's alter, Everett M, who from another universe, is posing as him. Who will get the Infundibulum, and how will the Everness and her crew leave the Jiju?