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Watch "The Lineup," for an investigative look at America’s high-profile crimes and cases, murders and mysteries. It's Crime Time coverage on FOX News Channel!

Here are just some of the stories we’re investigating with Megyn Kendall as our host Saturday:

The top cop probing the disappearance of Natalee Holloway in Aruba says endless meddling and threats by her mom and stepdad are to blame for the case remaining unsolved. We’ll hear what Natalee’s mom has to say about these accusations -- Beth Holloway Twitty joins us live. Plus, we’ll have legal analysis from former San Francisco assistant district attorney Jim Hammer and criminal defense attorney Jeff Brown.

And the search continues for missing pregnant Wisconsin woman Christine Rudy. The woman disappeared nearly a month ago after an argument with her husband left her by the side of a road. Are police finding any clues that might solve this mystery? We’ll talk with Jim Backus of the Clark County, Wisconsin Sheriff’s Department, and Mayor Richard Rogers of Fennimore, Wis., who found Christine crying at his church the day before she disappeared.

Plus, a Florida judge rejects a plea deal from Debra Lafave, the teacher accused of having sex with her 14-year-old student. Now she’s headed for a trial and could face up to 30 years in prison. We’ll have reaction from Owen Lafave, Debra’s ex-husband, criminal defense attorney Jeff Brown and former San Francisco assistant district attorney Jim Hammer.

Then, singer Olivia Newton-John speaks out for the first time about her missing boyfriend on Australian television this week. We’ll hear from Seven Network Australia correspondent Louise Pennell about Olivia Newton-John’s anguish following the disappearance of her long-time boyfriend Patrick McDermott, who vanished on an overnight fishing trip June 30 off the California coast.

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