In the city of Eldra,people are ruled by ancient prophecies. For centuriesthe high council has stayed in power by virtue of the prophecies of the elder seers. After the last infallible prophecy came to passgrowing unrest led to murders and an eventual rebellion that raged for more than a decade. In the present dayCassathe orphaned daughter of rebelsis determined to fight back against the high councilwhich governs Eldra from behind the walls of the citadel. Her only allies are no-nonsense Alyseasygoing Evanderand perpetually underestimated Newt. Cassa struggles to come to terms with the legacy of rebellion her dead parents have left herand the fear that she may be inadequate to shoulder the burden. But by the time Cassa and her friends uncover the mystery of the final infallible prophecyit may be too late to save the city–or themselves.