The Boxer Germán Bronco Torres loses his license, and works as bouncer at the cabaret El Pirulí, where he falls for the fichera Carmen, and befriends of the pimp Margarito Fuensanta El Vaselinas, who lost a bet and has to pay to a gangsters. For 500 pesos for El Vaselinas, Bronco prepares a trap in the cabaret to the taxi driver Raul, to seduce his girlfriend, not knowing that the victim is his own sister Lupita.
In his eagerness, to be movie extras, Tin Tan and his carnal Marcelo police get into trouble, among other entanglements.
To conquer the beautiful vedette Rosita, journalist Tin Tan is subject to her whims. Fired along with his friend Narciso from the newspaper they worked, Tin Tan trying to sell a movie plot. A woman looking to buy it and Tin Tan will visit her in a gloomy mansion where a mess is unleashed.
A series of murders have occurred in the uppermost circles of society. Detective Felipe Fierro vows to solve the killings, or die trying (which is a strong possibility).
