For a while they were kind and considerate and made an effort to make her feel comfortable. But it didn’t last long. Teresa had three other older children and Rosa soon got the impression that the family regretted taking her in.

Enrique first came to her bedroom two nights after her seventh birthday. He kissed her on the mouth and touched her between the legs, making her promise not to tell anyone.

The next time, a week later, he made her touch his penis and told her what to do with it.

Soon he was raping her on a regular basis and when she cried he slapped her and pinched her cheeks and threatened to strangle her if she didn’t act like she enjoyed it.

It was obvious that her aunt knew about it and chose to turn a blind eye. But then she was also afraid of Enrique because he was a violent, controlling man with a fierce temper.

The abuse carried on for four years, during which time she was farmed out on occasion to Enrique’s perverted friends.

Then, just three days before her eleventh birthday, Rosa decided she’d had enough.

They were sitting around the kitchen table eating dinner – Rosa, Enrique, Teresa and their youngest son Pedro.

When Rosa was handed the bread knife and told to slice the loaf, she was gripped by a sudden rage so fierce that it propelled her out of her chair. A second later she was lunging at Enrique and thrusting the knife into his chest.

He fell back on his chair and she went down with him. Before Teresa and Pedro could pull her off she managed to stab him twice more – in the mouth and in the right eye socket.

Enrique died before the ambulance arrived and Rosa spent the next seven years in juvenile prison where she learned that life is cheap and you have to be strong to survive.

She cultivated friendships with seasoned criminals, especially those with ties to the cartels. And through them she eventually learned the identity of the man who had murdered her parents.

His name was Antonio Garcia and she swore that one day she would get her revenge.

That day came shortly after she was released at the age of eighteen. She tracked Garcia down to a house in Durango and stalked him for several days. He was arriving home late one evening when she decided to strike. She rushed up behind him just as he was opening his front door. She shoved the muzzle of a gun into his back and ordered him to go inside where she quickly rendered him unconscious with a blow to the head.

When he woke up five minutes later he was handcuffed to a chair and that was where he stayed throughout the night while Rosa systematically tortured him.