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India Eisley as Fauna Hodel on TNT's "I Am the Night" (Credit: Clay Enos)

Actress India Eisley told Download.com that she was drawn to TNT's suspenseful new limited series, "I Am the Night" for two reasons.

The first was the opportunity for the "Underworld: Awakening" and "Look Away" actress to work with a hero of hers, "Monster" and "Wonder Woman" director Patty Jenkins. The second was her obsession with true-crime stories, especially unsolved cases like the infamous Black Dahlia murder. Of course, "Monster" is based on the true story of real-life serial killer Aileen Wuornos.

"I'm a major fan of Patty Jenkins 'cause 'Monster' made a huge impact on me when I was much younger, when I saw it, so the thought of working with her was absolutely brilliant," Eisley said. "And obviously, when I looked into the story and Fauna Hodel's life, the job really ticked all of the boxes."

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Eisley plays the late Fauna Hodel, the granddaughter of debaucherous LA doctor George Hodel, one of the prime suspects in the Black Dahlia murder in the six-episode series. She admits that she can go on for hours and hours about her various theories about the case and who the killer of aspiring actress, Elizabeth Short, was. What's more interesting to her, however, is what goes into the making of a murderer.

"Every killer and every case is different, and I just think it's fascinating to know the different causes -- the nature versus nurture conversation," she said. "What does it take to create one incredibly messed-up being that could actually ruin other people's lives?"

But suspense drama "I Am the Night," written by Sam Sheridan, inspired by Fauna Hodel's book "One Day She'll Darken: The Mysterious Beginnings Of Fauna Hodel" and co-starring "Star Trek" and "Wonder Woman" actor Chris Pine as a disgraced journalist, investigating George Hodel (Jefferson Mays), is as much about the formation of Fauna Hodel, a teenage girl, trying to piece together her own origins after being adopted at birth, as it is about uncovering her grandfather's sinister secrets. Eisley calls her character "a light in such a dark set of circumstances."

The actress also spoke to Download.com about her ambivalence toward tech, her killer app ideas to save humanity and her favorite app -- to the horror of her generation.

What's the one app that you use the most?

Probably WhatsApp (download for iOS and Android) because most of my relatives are all in England, so that's pretty useful. Then iTunes (download for Mac and Windows) for playing music.

Instead of Spotify (download for iOS and Android), I use iTunes. It's not a conscious decision. I've just never really used Spotify much to the horror of my generation. So I'm a bit lazy. I'd probably like it, but I just haven't gotten around to delve into it enough.

What's the last app you downloaded?

It was Dropbox (download for iOS and Android) because I had done a photo shoot and they needed to send me pictures. I needed to have Dropbox, so I could see them.

When you wake up in the morning, what are the first apps you look at?

I try to not look at my phone first thing in the morning, but I inevitably do and the first thing I look at is my Gmail (download for iOS and Android).

If you could invent your own app, what would it do?

I overthink a lot of things, so an app to shut off my brain for a few hours would be nice, as horrible as that sounds.

If there was an app that could save civilization, what would it be?

There are so many things that are threats, either one to help global warming and climate change and all of that, or on a civilian level, one for homelessness. I think homelessness is inexcusable. If you're in a position where you can help, I think it's your responsibility to help. If someone needs help, you help them, period. That's how I was brought up.

Are you an Android or Apple user? Why?

Honestly, I'm just inept with all things tech and my family had the iPhone plan, so I just ended up having one. It wasn't really a conscious decision. If I had my way, I'd just have my old Motorola flip phone. But no one agrees, so...

"I Am the Night" premieres Monday, January 28, at 9 p.m. (ET/PT) on TNT. Watch on TV or through the Watch TNT (download for iOS and Android) app.

For more on the Black Dahlia murder, tune in to the TNT-produced "Root of Evil: The True Story of the Hodel Family and the Black Dahlia" podcast, an eight-part podcast documentary series premiering January 30 on Apple Podcasts and other podcast platforms.

FOLLOW Download.com on Twitter for all the latest app news.

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Fauna Hodel comes face to face with her grandfather George Hodel (Jefferson Mays) in "I Am the Night." (Credit: Clay Enos/TNT)

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Joshua is an editor for CNET's Download.com. He covers the mobile tech and apps that power our lives and interviews celebrities about their favorite apps. Previously, he worked as an editor at Healthline and Gay.com and as a contributing writer for Mac Directory, MacAddict, SF Weekly, SF Examiner, and SF Chronicle.