1800. American adventurer Ethan Gage carries out secret assignments for Napoleon Bonaparte, seduces his sister and witnesses the Battle of Marengo in Italy. Having met the mysterious Norwegian Magnus Bloodhammer in Paris, Ethan Gage goes with him to America in search of evidence of the presence of the Scandinavians there in the Middle Ages, the main one of which is the hammer of Thor, the powerful weapon of the ancient Scandinavian god. On the way to their goal, they face many dangers: confrontation with wild nature, battles with bloodthirsty Indians, treachery and betrayal of followers of Egyptian Freemasonry.