When sixteen-year-old Dan Renfrew accidentally transports himself to England in the year 1066, he learns he is a time jumper, descended from a long line of secret heroes who protect the present by traveling to the past to fix breaks and glitches in the time stream. Now he is dealing with suspicious Anglo-Saxons, marauding Vikings, and invading Normans. To get home alive, Dan must try to restore history: a band of malicious time jumpers is threatening the very future of our world.