Chloe Grace Moretz, Jamie Blackley on 'If I Stay'

The actors talk about the challenges of bringing the bestselling book to life.
3:00 | 08/18/14

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Transcript for Chloe Grace Moretz, Jamie Blackley on 'If I Stay'
I'm sitting here with two stars of the highly-anticipated film "If I stay" based on the number one best-selling novel. Please welcome Chloe grace morets, Mia, a cellist, who faces a life and death decision, but not before falling in love with this guy, Jaime black lee. Take a look at a clip. Why me? Because I like to watch you play. You go to another place. And you're beautiful. You get this crease in your forehead right there. Why do I have this feeling you're about to mess up my entire life? A little mess never hurt anybody. ? So you guys have said it was really important to do grace Forman's novel justice. That service crucial to you. Talk about that. Yeah, one of the main things I fell in love with was Gail's novel and how emotional and brilliant. When I read the script and the book simultaneously. I felt really connected to the book ads Mia. She found the chel low at 8 years old, and I found acting at 5 years old. I needed to show the audience who she is through the book's eyes, not just the screen. Because so many people love the book, it was just for us about making sure that people come out of the movie with the same feeling. It's number one on the new York times best seller list. Is that added pressure as the ones bringing the story to life? I don't know. I think it's just great. It's exciting. Yeah. I think it's cool to see that larger audiences are enjoying the book and understanding the book. That's what drove us to make the movie. When people read the book first and foremost before the movie, it's more exciting. We tried to stay true to the bock. Talk about the chemistry. Did you know each other? No. We just made sure that we messed around the entire time and didn't take ourselves too seriously. That's really kind of fooling people. I love the director said about you, Jaime, that after your audition tape, she thought somebody had gone into her brain and pulled you out. You were the epitome of the character. Well, I don't know. I mean -- I just kind of went in there -- I was so nervous. Because our chemistry with Chloe, and I was so scared. But for me, it was going in there, the same way people connect with the characters Reading the book is the same way I interpret it. I guess I got the right interpretation for them. I'll say. You looked so natural playing the cello. Were you doing that before making 30 movies before the age of 17? I trained for about seven months or so. I tried to get the technicality down. But in seven months, you can't learn such an intricate instrument. What I had to learn is the emotionality and the passion that comes with being a cellist. And how much you have to give your soul and entire being to this instrument playing it. And the technicality came from a Frankenstein putting my head on another girl's body who was an amazing cellist. That's the beauty of film. It is. We talked about passion and playing the cello. It's beautiful and emotional. Not going to give it away. People love the book and congratulations. Great to see you all. Everybody, "If I stay" opened nationwide this Friday.

This transcript has been automatically generated and may not be 100% accurate.

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