The acquaintance of the corsair captain Andrew Fox, nicknamed the Fox, with the novice Nathanael from the captured Dutch ship begins with the fact that the “nun” Natty tries to kill him. At first, a reluctant passenger carrying half of a mysterious map and precious rubies to Jamaica, and later a cabin boy on his schooner "Pretty Woman", Natty becomes a constant and faithful companion of the corsair: both in the City of Lost Ships, where they are thrown by a storm, and in the dead Tenochtitlan, full of ancient Indian traps and gold, and even in Spanish captivity, from where they get out with the help of a cabin boy. Only the captain knows what connects Natty with the famous Pirate Scourge, and who Natty really is...