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2013 Winner Amazon Breakthrough Novel Award Grand Prize and Young Adult Fiction WinnerWhen Kate Pierce-Kellers grandmother gives her a strange blue medallion and speaks of time travel, sixteen-year-old Kate assumes the old woman is delusional. But it all becomes horrifyingly real when a murder in the past destroys the foundation of Kates present-day life. Suddenly, that medallion is the only thing protecting Kate from blinking out of existence.Kate learns that the 1893 killing is part of something much more sinister, and her genetic ability to time travel makes Kate the only one who can fix the future. Risking everything, she travels back in time to the Chicago Worlds Fair to try to prevent the murder and the chain of events that follows.Changing the timeline comes with a personal costif Kate succeeds, the boy she loves will have no memory of her existence.