"Esta and Harte race through time and across the country to steal back the remaining elemental stones needed to bind the book's power, stop the Order, and save the future of the Mageus"-- Provided by publisher.

Esta uses her affinity for time to give her an edge, and she's trained her whole life for one mission: travel back to 1902 New York, steal the ancient Book of Mysteries, and use its power to destroy the Brink and free the Mageus from the Order's control. But Seshat, an angry goddess was trapped within its pages. Now that terrible power lives within Harte, and if given the chance, Seshat will use Esta to destroy the world and take her revenge. Searching for the elemental stones needed to bind Seshat's power, Esta and Harte have found themselves stranded in time with a continent between them. And the Order is no longer the only obstacle standing in her way. -- Adapted from jacket.