After adventures in sixteenth-century Scotland and 1980s Hollywood, Jennifer Cloud has become something of a seasoned time traveler. Her family's amazing abilities have allowed her to take a job with a time-traveling agency, the World Travel Federation, and stop "brigands," criminals dedicated to destroying history for their own selfish gain.

Jennifer may have adjusted to her job at the World Travel Federation, but she can't adjust to the unfortunate change of status of her boyfriend and fellow time traveler, Caiyan. He gave up his key, the one thing that allows him to time travel,...