After they are rescued from imminent death, Maddy, Liam, and Sal join forces to correct changes in history made by other time travelers, using a "time bubble" surrounding the attack on the Twin Towers to hide their journeys.
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Maddy, Liam, and Sal were saved from certain death to become agents for TimeRiders, a group created to stop time travel from destroying the world. When a new threat appears-with evil tracing back to World War II- the TimeRiders go back in time to Nazi Germany and then forward into an ever-shifting present, to fulfill their destinies as keepers of time.
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