Madrid, the beginning of the century. One day, the police inspector Santos Trinidad coming home very drunk, is involved in a triple murder. But there is a witness who managed to escape and that could incriminate him. Santos undertakes an investigation to locate and eliminate the witness. Meanwhile, Chacón a judge in charge of investigating the triple murder, meticulously advances in the search for the murderer. Santos and Chacon soon discover that what seemed a simple case of drug trafficking is actually something far more dangerous.