InSanFrancisco,thesportsmanKayHoogtellstothemembersofaclubthathehasfoundamessageinabottlewithamapfromaHarvard'smissingprofessortellingaboutatreasureofanIncalostcivilizationstillalive.HedecidestogotoPerutoseekthegold.However,membersofthesecretcriminalorganizationTheSpidersleadedbyLioShabreakinKay'smansionduringthenightandstealthemap.KayHoogtravelstoPeru,whereheretrieveshismapandadocumentabouttheDiamondShipfromTheSpiders.LaterhesavesthePriestessoftheSunNaelaandbringshertoSanFrancisco.However,TheSpiderskillNaelaandKayHoogpromisesrevengeforthedeathofhislove