Josephine Eloise Thomas is in Paris receiving a huge reward for solving one of the world's greatest art heists. But she's not alone. Gabriel Barbier, the gorgeous French boy who helped her solve the crime is there too, along with their families and the ghost of Louis XVII, who is still Josephine's big secret, for now at least. Amid the celebrations the chilling news that Anastasia, the mastermind behind the crime, has escaped from custody sets everyone on edge.

Upon arriving home to the chateau, the search for information about Josephine's mother along with the hunt for Louis's long-lost love, Madeleine Aubert - both reveal more twists and turns than Josephine could ever have dreamed of.

Then, when Josephine's best friend Harriet arrives from Singapore, the discovery of a prehistoric underground cave network takes the girls, Gabriel and Louis on an adventure like no other . . . but at a dangerous cost.

Will Anastasia stay away or exact her revenge on the children who put her behind bars? Can Louis help save them this time or will things go horribly wrong? And will Josephine EVER get a kiss from Gabriel?