Having returned from the deep past, Cassie is angry that her life appears to have been constantly manipulated. Her mind is buzzing with questions and she is on a quest to find answers to them all.

How did the device arrive in the Stone Age in the first place? What is the real story behind that scar on her cheek? How is Jason's missing father, Patrick, connected to her nightmares of Lollard's Pit and Cow Tower in 1549? And why did those nightmares first appear in her 6-year-old mind when she didn't live through those events until she was seventeen? Finally, who is the mysterious old lady who not only seems to know all about Cassie's ability to time travel but also seems to be tracking Kay's trips through the portals?

Time's Paradox weaves itself in and around the two earlier books in the series to make you question what you thought you already knew about Cassie's previous adventures. Will everything get resolved by the end?