Fernando Flaquer

A secret agent investigates the death of the scientist who created a deadly ray only to find out his own wife is involved.

When the father of the struggling painter Ernesto passes away, he is left in misery. The banker Julián, a friend of the deceased, intends to help Ernesto: he appoints him as his secretary and takes him to live in his house. There, Ernesto meets Teodora, Julián's wife. People gossip about a supposed love affair between Ernesto and Teodora, who go together, without Julián, to see the opera The Thieving Magpie at the Principal Theater.

An American soldier marooned in Mexico is mistaken for a wife-butchering serial killer.