. >> reporter: that's why they travel the world, gathering evidence to give to authoritiea. and a camera crew is following them for a new film, "the abolitionists." and this multimillion-dollar mansion they rented. and this filmmaker wire the place for sound and video for the colombian officials to get evidence. for weeks, they've been putting the word out to gather girls for the party. thursday morning, the day of the party, they're getting set. almost showtime, huh? >> yes. >> reporter: are you nervous? >> yes, but it's good. >> i think it's going to be weird when we see the girls. it's going to set in, this is who's been sex trafficked. >> reporter: this sign making it look like it's a teenager's birthday party. some of the men splash beer on their faces and clothes. >> i want them to smell plenty of beer on me. >> reporter: laurie holden's assignment, keep the girls busy in the pool while tim keeps the traffickers busy. >> this could be a big challenge, our hearts are going to break the second they walk in. >> reporter: but her fame could blow the group's cover. she's go