Book Five of the series continues the epic journey of Oliver and Nikko as they struggle to find the remaining pieces of the Map of Gneima. While in Vulcanage, the team becomes divided and members are left to their own wits to find a path home. Oliver and Nikko embark on a grand odyssey in the Sea of Imbrium and face countless monsters and powerful magic that threaten their quest. Donus and Perdita are blocked in their efforts to return to Rootan as Gemma seeks to reunite with Oliver and Nikko before they cast off from port. Meanwhile, Barbarot pushes to finish his conquest of all the kingdoms of the empire so he might lay claim to the Emperor's throne. ... and so the epic quest continues.