(NBC News) — Tonight on “Dateline,” when actress Aasha Davis and her sister Lesley move to Hollywood, things appear to be going well. But just as Aasha’s star is rising, Lesley suddenly vanishes.

“Dateline: A Sister’s Search,” includes interviews Aasha Davis, Lesley and Aasha’s mother Vivian Telford and more.

Here is a preview of Josh Mankiewicz’s report:

Hollywood’s a real place but it’s also a myth, but the fantasy of what might be has always drawn the hopeful from every town with a bus station.

For quite different reasons it drew these two sisters, Lesley and Aasha.

Maybe you recognize Aasha Davis. She’s one of those lucky few, for whom that Hollywood fantasy came true. Her star rose quickly within a few years of her move west.

But in 2009 A real-life drama began that tested her strength in a way the climb up the Hollywood ladder never had.

Aasha was used to facing the cameras, but this wasn’t on a set or for a publicity tour. The scene was a news conference where Aasha begged for help from anyone who would listen.

Watch “Dateline: A Sister’s Search” tonight on NBC4 at 10 p.m.

About “Dateline”

“Dateline NBC” is the longest-running series in NBC primetime history and is in its 30th season. Dateline is anchored by Lester Holt and features correspondents Andrea Canning, Josh Mankiewicz, Natalie Morales, Keith Morrison and Dennis Murphy.

Dateline is the #1 Friday newsmagazine and reaches more than 17 million people every week through its broadcast, and millions more through its social media platforms and podcasts.

The stories range from compelling mysteries to powerful documentaries and in-depth investigations. When major news breaks, they go to the scene, putting the pieces together to bring the viewer the full picture. And in every story they tell, they help the real people who lived the events share their journeys with the viewer.

This past season, Dateline debuted two new podcasts, “Mommy Doomsday” and “Killer Role,” hosted by correspondent Keith Morrison.

In February, NBC also greenlit a straight-to-series inspired by the story featured in the Dateline podcast series, “The Thing About Pam.” Two-time Oscar-winning actress Renee Zellweger will star and executive produce the series, in collaboration with Blumhouse Television, NBC News Studios and Zellweger’s Big Picture Co.