sinister than just wanting her to go to pittsburgh. >> to what extent were you thinking? >> i didn't know. if he'd hired somebody -- to do somethin', who knows what they're gonna do? >> turns out, the bail bondsman also happened to be a city councilman and a friend of the houston police chief. so, he gave the chief a call and said they should take a closer look at leon -- and the mysterious zack. >> coming up -- an undercover mission to learn what leon's really up to. >> he's giving you a way to kill someone. >> very detailed, precise instruction. and the real jaw-dropper? meghan wasn't the only target. >> we're taking care of both problems? >> what both problems? >> both of the individuals we're talking about. >> when dateline continues. in terms of treating sensitivity, 3 days is really fast. the dentist is going to be able to provide that to their patients. sensodyne rapid relief in my opinion is a game changer. it's going to let the dentist offer their patient