In an alternate version of present-day Manhattan, magic is dying, and Esta, a Mageus with a talent for manipulating time, travels back to 1901 to stop the destruction of a book that can possibly restore magic, but in Old New York, Esta must navigate gangs, secret societies, and her feelings for another magician in order to save the future of magic.

Esta's parents were murdered. Her life was stolen. And everything she knew about magic was a lie. She thought the Book of Mysteries held the key to freeing the Mageus from the Order's grasp, but the danger within its pages was greater than she ever imagined. To bind the power, Esta and Harte must track down four elemental stones scattered across the continent. As past and future collide, time is running out to rewrite history, even for a time-traveling...