Relocated to Victorian London, the TimeRiders joy-ride back to 1666 to witness the Great Fire of London. In the ensuing chaos, Liam and their newest recruit, Rashim, find themselves trapped between the fire and the Thames. They escape onboard a river boat, only to be confronted by an unscrupulous captain with his heart set on treasures of the high seas . . .

Back in 1888, Maddy and the rest of the team are frantically trying to track them down. But with limited resources at their new base, can Liam and Rashim survive the bloodthirsty and barbaric age of piracy long enough to be rescued?