Still fully engaging at the end of a long day of interviews, actress Saoirse Ronan seems as eager to dive into the particulars of Peter Jackson’s latest film, “The Lovely Bones,” as she might have been before being asked every question in the book. Her energy is undeniable, as well as her poise, a young actress grounded but hungry for challenging work.

Her performance in Jackson’s film is a considerable notch in the 15-year-old’s early career. As Susie Salmon, the ill-fated youth at the center of Alice Sebold’s best-selling novel, Ronan had to go places she certainly never has as a performer. But the working environment and relationship her director developed on the set deserves a great deal of the credit, she says.

“I don’t think I could really label what I’ve learned from Pete,” Ronan says. “I was with him for about nine months and being with someone like that every day that gets the best performance out of you that I can give makes you work hard as an actor and therefore makes you grow as an actor, and hopefully makes you a better actor. So I suppose you could say he’s made me a better actor.”

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