Louis explores the sex trade in Houston, examining how the city has become a major centre for people trafficking, with one in five victims in the US being transported there. He also uncovers the complex dynamic between prostitutes and pimps, learning the rules the sex trade is run by and the factors that prevent women from escaping abusive arrangements. Louis also accompanies vice officers on an undercover operation, and talks to them about the challenges they face in persuading prostitutes to testify against pimps.