Based on the chilling real events that shocked Mexico. A young man who seems to have everything in life, suddenly loses his mind and plans the murder of his girlfriend and her family. Tragedy and blood envelop Karla's life when one night a hooded man breaks into her home, attacks two small children and then tries to kill her. The truth is hidden behind the sick relationship of Karla and her boyfriend.

The newly appointed police captain is put in charge of breaking up a drug trafficking gang.