1882, in Saint-Petersbourg. Sacha, a young girl of the Russian aristocracy, has always been fascinated by her grand-father Oloukine’s life of adventure. A renowned explorer, designer of a magnificent ship, the Davaï, he has never come back from his last expedition to the conquest of the North Pole. Sacha decides to sail toward the North, on the track of her grand-father to find the famous ship.