Captain Rojas arrives in northern Chile to investigate the mysterious disappearance of a group of teenage girls in Alto Hospicio and discovers a disturbing truth.

Rojas and Carrasco travel to Tacna, a wild Peruvian city on the border with Chile; Rojas infiltrates the people-trafficking gangs who deal in slaves in attempt to locate the missing girls.

After reviewing all the murders of women in the area, Rojas believes he has found his serial killer's first murder; Carraco has suspicions on a suspect who had ties to many of the missing girls.

Following the trail of disappearances leads Rojas to "La Ponderosa," a place in the middle of the desert where private parties are held with prostitutes, many of whom are minors.

Rojas' investigation into institutional corruption in Alto Hospicio puts him in the sights of several powerful men in the area.

A brutal attempt to intimidate Rojas only reinforces his need to continue investigating.