Wrong. Detectives would launch an undercover operation. Its time to come clean, okay . That would lead to a long buried shocker. Are you ready for whats coming . How do you say youre ready for that . I know that it has to happen. A disappearance in the desert. Could it be the perfect crime . I can only imagine what it would be like keeping that type of a secret. Welcome to dateline. Im lester holt. For eight years it was a mystery. A husband who had simply vanished. On the surface it didnt make sense. He had a wife, a lucrative job, a daughter he loved. But investigators were told he also had a secret. So was he missing or was he hiding . That question would lead detectives to a dark discovery because someone else had a secret too. Heres josh mankiewicz. Theres an old saying that two people can keep a secret if one of them is dead. We never talked about what happened or why it happened. Every marriage has its secrets. And this one was no different. But what if the secret becomes bigger