For decades, hundreds and more have gone to the Sea of Trees to commit suicide.

But despite having vanished in that menacing location several days ago, Sara can sense her twin is alive.

Oh, andGame of Thronesjust might have come up too…

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So this is your first horror movie.

Have you been a fan of the genre before now?

No, not really.

I surprised myself from the way I responded to the script.

I just like good filmmaking, I just like good storytelling.

What about this script made it stand out to you then?

Im sure there have been many other horror movie scripts youve read in the past.

To me, the intelligence and the psychology of itits a psychological horror.

Her descent into madness.

And I loved the fact that the central relationship was two sisters.

Had you heard about this place before?

I was very surprised when I googled it.

I googled it at exactly the moment in the script.

And I was just fascinated by the whole heritage of the place.

They have a lot of superstition and respect for it.

Its sacrosanct to them.

Did you see anything like that or anything unusual while you were over there?

I didnt see anything unusual, but I stood in front of the signs.

And the tape that people tie around trees, or rope, to walk in is there.

People with kids walking along, very happy, a lovely hiking trail.

But youre just not playing Sara, youre actually playing two sisters.

Theyre identical twins, but very different personalities and perspectives.

Can you talk a little about how you were able to play two distinct characters?

Its very much on the page.

Theyre the perfect example of two people who have had a trauma and gone in the opposite direction.

Ones gone wild child, and the others become very overachiever, a control-freak, really.

And the characterizations werent difficult, because the writing was there.

And you know, I didnt take Saras walk into Jess walk.

The voice was still a little bit where I could give some kind of distinction between the voices.

It was just making sure in the actual, technical physicality of them that they read differently.

Whats also interesting is that Sara is the nice one; she looks away from the worlds horrors.

But this whole story is about her experiencing that horror, suffering from it.

I just loved the fact that Sara is carrying this profound guilt that she has never processed.

Its almost like she did it to herself.

She held onto this thing and she hasnt processed it.

We have all done things in our past that we regret.

That we wish we could take back.

Weve all hurt someone that we care about at some point and wish we hadnt.

Or regret the way we did it.

The location scouts will be so pleased!

[Laughs]

But youve never done a role like this before.

What surprised you in the process of shooting it?

I dont know if I was surprised; it was as I expected with how tired I got.

Youre playing tension constantly, so you become a bit [spastic].

Youre carrying that tension back to the hotel room with you every night.

But it really helped me with the psychology of knowing exactly where I come from and where Im going.

To change gears for a moment, have you finished shooting yet season 6 ofGame of Thrones?

Margaery is in a different place this season than she was at the beginning of last year.

Can you talk a little about how you prepared for that?

Ive had some great stuff with Sophie Turner in the past, and some great stuff with Lena Headey.

And Ive got a whole new partner to play with in this season.

So, I had a lot of fun there.

Were you ever able to talk with George [R.R.

Martin] or [Game of Thronesshowrunners David and D.B.

Weiss] about those historic parallels and if they influenced you at all?

And I dont want to play the same character twice.

And Dan and David were like, Nat, we trust you.

Youre a talented actor, bless them for saying.

Dont worry about it, thats not going to happen.

Your characterization will be different, we trust you.

And I went, Okay!

Maybe more fool you!

[Laughs] But in the end, they were right.

They did turn out to be two totally different women.

So, I think I had real trepidation and concern about doing that.

They read as different people completely.

Im also glad you took the role.

Thank you very much and Merry Christmas.

read more: Game of Thrones Season 8 Everything We Know