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.
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.
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.
Taavetti, the young master of Rantasuo, refuses to give up, even though frost destroys his harvest, a crooked logger steals his forest money, and a dishonest bailiff takes away his freedom.