Nine years after Paul Muad'Dib walked into the desert, his twin children Leto and Ghanima have become the most valuable - and most dangerous - figures in the empire. Like their father, the twins possess prescient abilities that make them targets for every faction seeking to control the imperial throne. Their aunt Alia rules as regent, but something is wrong with Alia - the ancestral memories she carries are overwhelming her from within. As plots converge on the twins from all directions, young Leto faces a choice that could transform humanity's future or destroy it.