What can connect Munich with Piraeus, Spetses, and Tamouria?

What can a locked old trunk, abandoned for many years in the storage of a Piraeus house, hide?

The thirteen-year-old Nikitas and his peer friend Sofia think it might contain gold sovereigns and jewelry.

However, what they find when opening the trunk exceeds all imagination, and ultimately, what started as a fun exploration game brings the two children face to face with a deadly danger.

Because hidden in the trunk are guilty secrets from the time of the Occupation and valuable information about ancient treasures. And those seeking them are ruthless!