InSanFrancisco,thesportsmanKayHoogtellstothemembersofaclubthathehasfoundamessageinabottlewithamapfromaHarvard'smissingprofessortellingaboutatreasureofanIncalostcivilizationstillalive.HedecidestogotoPerutoseekthegold.However,membersofthesecretcriminalorganization"TheSpiders"leadedbyLioShabreakinKay'smansionduringthenightandstealthemap.KayHoogtravelstoPeru,whereheretrieveshismapandadocumentabouttheDiamondShipfromTheSpiders.LaterhesavesthePriestessoftheSunNaelaandbringshertoSanFrancisco.However,TheSpiderskillNaelaandKayHoogpromisesrevengeforthedeathofhislove