Gwen has always felt gawky and awkward next to her perfect cousin Charlotte, especially since Charlotte carries a once-in-a-generation time-travel gene that runs though the female side of their family. So sixteen-year-old Gwen is totally unprepared when it turns out that she, not Charlotte, is the carrier of the gene. She's quickly scooped up by the guardians, members of a secret society stretching back centuries, who introduce her to Gideon, a snobby — but very cute — time traveler from another gene-carrying family. As she and Gideon start traveling together, she finds herself in the middle of an inexplicable web of mystery and intrigue. Only one thing is clear: there's a lot her family, the guardians, and even Gideon aren't telling her. And it's putting her, and maybe many others, in grave danger. Can she crack the conspiracy before the course of human history is changed for the worse? Find out in this heart-pounding tale of powerful legacies and age-old secrets.