With the whole of human history altered, Denny Younger may be the last rewinder in existence-and the last person on earth with a chaser unit capable of time travel. While caring for his ailing sister, Denny must discover a way to recharge his device before he's left with no defense against a past that wants him dead. Before long, Denny notices a mysterious stranger following him-keeping tabs on Denny, his family, and his friends. Is Denny just paranoid?...