When a father is killed while searching for his daughter who came to the U.S. with dreams of being a model, the CSIs discover his murder and her disappearance are connected to a sex trafficking ring many underage girls have falling prey to. Mac gets help on the investigation from Deputy Inspector Gillian Whitford, whose niece went missing after pursuing a misleading job opportunity in dancing. Evidence on the murdered father's clothes leads the team to the warehouse the girls are kept in. But when they arrive to find the girls have already been moved, the team has to step up their efforts before the girls are relocated to another city or country.