Shortly before Tom and Sarah escape from Weatherly Orphanage in northern England, Tom discovers that his parents might still be alive and was left with a single clue: Britfield. They are thwarted once again when the ferry transporting them across the English Channel sinks. Now in France over six months later, Tom and Sarah are trapped on an island fortress and face an entirely new enemy: a nefarious and clandestine group with unlimited resources. Searching for the truth, Tom and Sarah must navigate the streets of Paris, Cathédrale Notre-Dame, the Eiffel Tower, and the Louvre, chased by an assassin determined to remove any threat to the British throne. Aided by old friends and new allies, the adventure is filled with twists and turns, unexpected betrayals, and life-changing revelations.