After 18 years in prison, Álex takes his revenge on the Lazcano family, who framed him for the murder of his sister Sara to save their reputation.

To exact his revenge, Álex will have to bring to light his sister's darker side – and come to terms with the fact that he never knew the real Sara.

In this final season, as enemies become allies, Álex gets an answer to the question that has tormented him for years: What really happened to Sara?