Seventeen-year-old John Spencer has more than one risky journey under his belt, but for the first time the schooner "Dragon" makes an overseas voyage. Few of the team have been to such distant countries. And therefore, sailors unconditionally believe in the stories about cannibals and pirates of the West Indies. Everyone understands that the voyage will not be easy, and a meeting on the open sea with a lone sailor in a boat is perceived as a fatal sign. A rescued man named Gorn, on the contrary, calls himself a lucky talisman, but is meeting him really such luck? John Spencer will receive the answer later, when he finds himself on an island where treasures are buried and full of pirates.