Intensifying skirmishes between a brutally oppressive conquistador imperialist and the last holdouts of Aztec resistance... and meanwhile, miraculous visitations of The Virgin Mary to two of the downtrodden and conquered indigenous peons.
J. P. Courtney wants to update the music on the radio program he sponsors, but his wife, Agatha Courtney, is the final authority and addicted to the classics and won't allow him to replace Professor Bistell and his symphonic orchestra.
Scientist-explorer David Lynd leaves wealthy bride-to-be June Claymore at the altar to join photographer Andy Parker and British secret service agent Leo Marzeli in search of rare minerals.
Carmelita and Uncle Matt find themselves in a haunted house, but the "ghosts" are actually enemy agents who are trying to frighten away visitors in order to develop a nitroglycerin bomb.