>> it's 50s, 20s, 10s. >> this inmate, who we've been calling cleo, has given up a money ring, it's her bargaining chip to get out of jail. >> any of those bills look familiar to you? >> this one right here. >> this is the location for sure? >> yes. >> cleo says she's trying to go home for her children's sakes and has no qualms about working with authors. >> i believe there are two people in prison. one who didn't tell and wish they had. i just need that money. >> your mom's not home? >> no. can i call back? >> yep. >> investigators can't move forward until cleo produces the $100 counterfeit bill that she claims she has at home. the trouble is, her drug-addicted mother may have found the money and spent it. >> mom, this is very important. i need you to do this. you know my traveling bag -- she put me on hold. >> be patient.