>> reporter: the undercover officer suggested some simpler execution options. >> take his car, leave him on the street. make sure he's dead. maybe put another bullet in his head. we call that a "double tap." they'll think it was a robbery. >> reporter: but first, adam wanted to know, was she sure? >> you need to give me the go-ahead. there's no going back on this, okay. >> what option do i have? he's going take my daughter. >> reporter: of course, explained adam, a second target would cost extra money. leon returned to the table to negotiate a payment plan. >> $5,000. >> after everything is done -- >> we'll take care of it. >> reporter: listening in from a nearby table was sergeant frank quinn, who was in charge of the undercover operation. so, now, you have a man and a woman who both want their exes dead. >> yes. >> reporter: is that beyond anything like it before. and it was really shocking. >> reporter: the meeting broke up. adam and taz promised to be in touch. investigators thought they had a