Beyond the Map's Boundary: A Timely Sort of Adventure

All Mattie Bott and Trevor Karington have ever known were unusually happy, stable lives without any hint as to who they really are. Suddenly, Mattie starts seeing into the future and witnessing historical events appearing on particles of light. Unknowingly, Mattie was born into a family of Trekkers (time travelers). In order to save Mattie from dissolving into the core of time, Trevor becomes her Splitter (time link), making it possible for her to return to the present following each Divvy (time travel) to the past. With the accidental discovery of the Rings of Prather Mendell, Trevor now shares many of her powers as her partner. Together they try to foil the plan of the Interloper (an illicit time traveler from the future), who will stop at nothing to possess the secret, supernatural abilities of the time travelers and the forbidden powers of the rings.