>> reporter: it was called operation abigail and went down at this local restaurant known for more its chicken wings than undercover stings. and "20/20" was taken right through it. so they walk in as a couple, and she's got the wire on where? >> underneath her clothing. >> reporter: and what does he think he's walking into? >> he thinks he's coming to talk to his wife about getting back together. >> reporter: about reconciliation? >> yes. >> reporter: but she has no plans to get back together? >> no. >> reporter: she's here for you? >> yes. >> reporter: cindy sat down with her husband, that wire tap hidden, with one intention. to catch karl karlsen on tape confessing to levi's murder. a confession, she had told investigators, he had already made to her once before. they're sitting at a table, just the two of them. >> yes. >> reporter: and she's got a wire on the whole time? >> yes. >> reporter: as the couple is sitting here at the table, how many undercover investigators are sitting...