Julieta dies after inhaling a strange powder in her mail. UNIC discovers that it was pure hyaluronic acid, lethal in high doses. The investigation reveals similar cases in the neighborhood. Paco, her husband, and Olivia, the administrator, are questioned, while a mysterious man observes. Paco, disguised as a police man, faces Roberto, a scientist with whom he shares a dark past. Olivia dies asphyxiated with the same powder. The plot reveals secrets, deep-seated hatred and a network of masked crimes.
