Life is progressing normally for sixteen-year-old Dan Renfrew when he accidentally transports himself to England in the year 1066. He soon realizes that he's trapped there, and that's not his only astonishing discovery. Dan learns that he's descended from a long line of time jumpers--secret heroes who travel to the past and resolve glitches in the time stream that threaten to alter subsequent history. The only way Dan can return home is to set history back on its proper course in the Anglo-Saxon age. This is no easy task. A Viking horde is ravaging England in the north while a Norman army threatens to invade from the south. In between and desperately struggling to hold on to his throne is Harold Godwinson, the newly-crowned English king. Dan is fighting to ensure that events play out correctly when he finds himself plunged into an even more lethal conflict. To save history, Dan must battle a band of malevolent time jumpers whose lust for wealth and power threatens the entire future of the world.