chunk: Jones is approached by greaser Mutt Williams, who tells him that Harold Oxley had found a crystal skull in Peru, suffered a mental breakdown, and was later kidnapped. In return, Jones tells Mutt about the legend of crystal skulls found in Akator. Mutt gives Jones a letter from his mother, who is also held captive, containing a riddle written by Oxley in an ancient Native American language. KGB agents try to take the letter, but Jones and Mutt evade them and reach Peru. At the local psychiatric hospital, Oxley's scribbles on the walls and floor of his cell lead them to the grave of Francisco de Orellana, a Conquistador searching for Akator. They discover the skull at the grave, with Jones reasoning that Oxley had returned it there.