Four brave women challenge ultraconservative norms in a Spanish-language crime drama created by Fernando Rovzar, which is based on true events. In 1970, Maria (Barbara Mori) proudly joins join Mexico's first female police force alongside fingerprint analyst Angeles (Ximena Sarinana), rebel Valentina (Natalia Tellez) and Gabina (Amorita Rasgado), whose father is a renowned cop. The media laps up the story as police struggle to apprehend a brutal serial killer and the woman quickly discover their appointments are a publicity stunt. In response, Maria, Angeles, Valentina and Gabina set up their own secret investigation into the serial killer and unmask the perpetrator