Ines has a quiet and happy life next to Ernesto, her husband. They are a model couple, but even in this type of couples things can happen that make this state of happiness break.
That is what stops with this couple the day that Ines discovers something that should not have seen. It is a letter addressed to her husband. It is a love letter with a heart that has no return.
That makes Ines stunned, but it does not take long to react and decide that she has to know who is the lover of her husband. Thanks to a call that intercepts knows that they are going to find in a park taking advantage of the darkness.
Ines was wrong because what presence is not a loving encounter, but a murder. Her husband kills the woman who meets him, who happens to be his secretary.