Ines is convinced that every wife is bound to be betrayed one day, so she is not surprised to find a note in her husband Ernesto's briefcase with a heart smeared in lipstick crossed by the words 'All Yours' and signed, 'Your true love.'

She follows him to a park on a rainy winter evening and witnesses a violent quarrel he has with another woman. The woman collapses; Ernesto sinks her body in a nearby lake. When Ernesto becomes a suspect in the case she provides him with an alibi. After all, hatred can bring people together as urgently as love. But Ernesto cannot bring his sexual adventures to an end, so Ines concocts a plan for revenge from which there is no return.