Raimundo Vázquez is architect and director of an important enterprise, he is serious and old-fashioned. His daugther of 16 years old, Susana, tells his that is pregnant...
A serpent, created by radioactivity, threatens a Spanish coastal town.
During the Spanish Civil War (1936-1939) a Republican detachment occupies a huge mansion near the front. One of the daughters of the owners of the house falls in love with a soldier, a young priest who seeks to keep hidden her condition.