Follows a man accused of killing the manager of the Gran Castilla Casino, his sister Ana Tramel, a brilliant lawyer, helps him in this unequal fight versus the powerful industry.

Ana finds out that her brother's wife and son have inherited a large debt with the casino. Ana files a lawsuit with the support of Lieutenant Moncada and her friend Concha.

The casino attempts to get the lawsuit dropped at all costs; Ana's ex-husband offers her some information.

Martín is found with the help of Ramiro; Ana comes across some vital information, but Moncada warns her of a double betrayal.

The trial against the casino commences; Ana shows her skills as a lawyer, but the defence presents a more than reasonable doubt on the evidence.

Ana concludes the trial with great support from Concha after dealing with a new attack. Ana launches one last play.