A group of rich businessmen and military officers who are partying in an old castle are spared when a nuclear war ravages the earth. When they venture out into the nearest town to search for food and supplies, they find most of the residents blinded, and soon they discover the existence of a sinister group called The People Who Own The Dark.
A small provincial town lives under the caprices of Don Justin, the local cacique. This forces the young Mariana to marry him, taking advantage of the fact that her nephew Juan, the boyfriend of the girl, is far away from military service. Upon his return, Juan is mocked and goes to a witch to assist him in his revenge.
Cecilio Rubes, a businessman engaged in the manufacture of baths and toilets, tries to remain neutral in the imminent Spanish civil war. But the attitude of Cécil, his only child, a spoiled boy who grows without respect their parents, will forced him to face the cruel reality of the facts. Jumping back and forth in time, we are shown his present and his past through his wife Adela and Paulina, the mistress of father and son.
