Paola and Paulina are twin sisters who were separated at birth. Paulina is a good young woman who lives in poverty. Paola is the evil, arrogant and decadent sister of the two, who is married to a wealthy man named Carlos Daniel Bracho (Fernando Colunga) but is frequently unfaithful to him. When the twins cross paths by chance, Paola blackmails Paulina by framing her for theft and threatening her with jail to force her to take Paola's place in the Bracho home while she takes a year-long overseas vacation with a new lover named Alessandro. Abandoned by her fiancé Osvaldo and following the death of her sick mother, Paulina submits to Paola's plan.