Teenager Molly Hamilton is set for a new adventure and she can't wait to ride the train and begin to explore the City of Lights, both above and below ground. But things don't always start the way she expects them to, when she meets up with her friends, Belle and Woody, she finds them strangely secretive. What do they know? What are they hiding? Will her Paris holiday turn out as expected? Will it be a search for answers to a two-hundred-year-old mystery?...