Monsters exist. They live inside us. And sometimes, they win.

After witnessing the murder of her mother 20 years ago, Alexa returns to Los Angeles seeking revenge on the man who killed her. She finds that her best way to reach this man is trough his son, who turn out to be nothing like his father.

Barely being able to make ends meet and doing everything he can possibly do to cover his ill son's growing medical bills, Hector Chavez turns to his fighting roots in the underbelly of LA. His amateur Mixed Martial Arts videos go viral grabbing the attention of the world's top MMA federation. Hector is then given a dream come true opportunity to go up against the MMA World Champion; a vicious fighter whose last opponent is in critical condition in the same hospital as his son. Hector is faced with a real do-or -die situation and must risk it all so his son can have the surgery he needs to survive.

Recounts the experiences of a middle-class family, the Alcántaras, during the last years of the rule of Francisco Franco and the beginning of the Spanish Transition to democracy.