It has been a year since Alex and Bartholomew first ventured into the mystical Artania. Now, Mona Lisa has been kidnapped, and the two are called in to investigate.

Peril awaits at every turn. Traitorous pirates, fearful gods, monsters of the deep. Artania's safety lies in their hands.

With their spunky sidekick Gwen, Alex and Bartholomew return to Artania to save Mona Lisa from the ruthless pirates. But can they reach her in time?