Drought. Mortgage. Dave to sell ranch, locale of a legendary Aztec treasure the earth swallowed up. Roy visits. Tad rides with Roy. Bullet fights a wild boar. Roy, Pat, Tad treed by a herd of angry javelinas. They disperse. Bullet bays a boar in a partly collapsed limestone cavern. They move the big rock. Trigger brings rope. They descend. Bullet pursues the boar into a hole. Roy follows, kills the attacking boar, finds old human bones. Pat finds a flintlock. Tad finds the Aztec gold. Flashlight goes out. Roy replaces batteries. Roof crashes, closes exit. They blast free with cartridge powder.