He shall thunder in the sky

As World War I looms over Egypt in 1914, Amelia Peabody and Radcliffe Emerson return to Cairo for a new season of digging. Their son Ramses faces public scorn for his pacifist views, but he is secretly entangled in a dangerous game of espionage and nationalist rebellion. When a misplaced artifact suggests their old nemesis Sethos has returned, the family must navigate a city on the brink of revolution.