>> followed by a shark. >> the meeting was set up for someone to hit her. >> if they find the shooter? >> no. >> just vanished? >> vanished. >> who was this mystery man on a midnight mission? >> it brought everything that you would need to murder someone. >> turns out it was a gunman police. and maybe even you already know. >> i had seen the dateline previously. >> someone was hiding a secret. >> where is their smoke, there is fire. >> someone else couldn't keep one. >> she just started crying and said, it's all true. it's all true. >> and a conspiracy to kill is caught on camera. >> when we opened that email and saw that video, we were like, oh my gosh. >> a shot in the dark and a stunner in court. >> every once in a while, we get a doozy. this was one of them. >> hello and welcome to "dateline".