Class differences in Mexican society are expressed in the life and behavior of a young couple member of the burgoisie that will soon become parents, in contrast to their servant and the fatal consequences she suffers due to an unwanted pregnancy.

A dispute for the inheritance of the father of this family is the motor for this comedy, where siblings Andrea and Hector start a discussion with their aunt, who turns out to be the universal heiress of their father's because they don't comply with the rules established by their father.

An erotic model has three lovers, one of them is the father of her child. Which of the three will be?