Flavia Bujor is a best-selling author. She lives in

one of the world's most beautiful and exciting cities -- Paris, France -- and her first novel, written in French, has been translated into 26 languages. But before she can talk to a reporter about her writing career, she must finish her homework.

That's because Flavia Bujor (pronounced Bu-JO) is 15.

She wrote "The Prophecy of the Stones" when she was 13, and it quickly became a hit in Paris, where it was first published. Last month the book went on sale in the United States. It's the story of three 14-year-old girls who must fulfill an ancient prophecy in a fantasy world, while another girl their age lies in a hospital fighting for her life. The stories at first seem unrelated, but soon it becomes clear how these four girls are linked.

Flavia talked to Tracy Grant about where she gets her ideas, how hard school is and about her friends.

How did you decide to write a book at age 13?

I wanted to write a book for a long time. It was not an idea that came to me when I was 13. My parents told me lots of stories, bought me a lot of books. I was fascinated by reading and stories. I started writing poems when I was maybe 6 years old. I was always imagining stories and telling them to my friends.

How long did it take you to write "Prophecy of the Stones"?

About six months. I didn't write every day. I didn't write when I had something else to do, like [seeing] friends, going to school, doing my homework. I wrote when I had time and when I wanted to -- in the evenings, weekends, vacations. It's more important to do the normal things.

What kind of normal things do you do?

I play piano. I started when I was 6 years old. I wanted to be a pianist when I was younger. I had to give that up because now I'm in high school and it's very hard. There's a lot, a lot of work. The days are very long. Class begins at 8 in the morning and I'm home at 6 in the evening. I have lots of homework.

You have four very different girls in this book. Are they based on people you know?

No one in particular, but it's normal that there is a little bit of everyone I know in them. But I didn't want to speak about my friends [in the book]. I wanted to give the impression that [the characters] are real, that they could exist.

Are you working on a book now?

Yes, but I don't have much time. It's going very slowly. It's a very different kind of book.

What do your friends think about your having written a best-selling book?

My friends don't see me as a best-selling author. They see me as I am. . . . This year I've changed my school, and my new friends are really not interested in the fact that I've written a book.