Peter and Elroy start their archeological excavation at Runestone Hill. They also meet Darwin who takes them to the cemetery where his grandfather is buried.
While the excavation continues, Peter and Elroy return to the investigation to clear Olof's name. They meet a professor who gives them new knowledge about the area and the history of his tribe.
With many new clues to follow, they head to the east coast to take a closer look at rock engravings that can provide more answers. They meet the historian Sturla Ellingvåg who takes them on a boat trip.
They finally get to see the famous Maine Penny, and the visit to the Maine State Museum opens their eyes to new opportunities. Afterwards, they meet the anthropologist Harald Prins.
After an intense search for more tangible evidence, Peter and Elroy choose to go in a different direction with the investigation. Each object leads them deeper into a web of mysterious symbols and conspiracies.
The adventure on the east coast is coming to an end, and Peter and Elroy think about what they have found and learned along the way. At the same time, a new plan is beginning to take shape.
