When the pieces of a singular figure are unearthed and then joined together, a devil of the lowest category breaks into a small Mediterranean village. From that moment on, the demon will enter the life of a painter named Bernardino, in the affairs of a "modern" marriage, in the existence of a frightened gardener and, finally, in the day-to-day life of the Great Momo.

The troubled story of the Churruca family, a noble lineage of brave seamen, descendants of Cosme Damián Churruca, the Spanish hero of the Battle of Trafalgar; from the Spanish-American War (1898) to the end of the Spanish Civil War (1936-39). (In 1950, a new cut of the film was released with less ideological depth and ten minutes shorter.)

Amidst the chaos of the Spanish Civil War, a nurse tends to a wounded pilot.

Alfredo Rivera and his cousin travel abroad from Buenos Aires to meet the sender of a mysterious letter. She happens to be a girl who has fallen in love with his name, used by her teacher as a fictitious recipient to practice commercial letters, her companions having sent one of the letters for fun.