undisclosed location. >> all right. i'm just going to follow you. >> detective bob explains this in-call operation is a more complicated game of cat and mouse. the seller of sex is completely in charge. >> they tell you general vicinity where they want you to go. you get to that spot and that intersection and you have to recontact them and then they'll give you the hotel they're at, or motel. >> call girls like alexis don't give up their precise location for two reasons. one, it ensures the john is close and ready to make the deal. and two, it gives pimps or women time to check them out. >> room 327 and she's watching out the window and she's telling me to pull in. 327. >> within minutes of arriving at the hotel, dan signals that a deal for sex has been made. alexis has offered oral sex and intercourse in exchange for $250.