Children's & Teen Editor Vicky Smith talks to Lauren Oliver about her ghost-story fantasy for middle-grade children, Liesl & Po. In a starred review, Kirkus called Liesl & Po an "irresistible read." Lauren talks about the role of sadness in children's books, some of her own favorite books and the importance of the word "ineffable."

Find more novels with great girl characters among our 2011 Best Books for Children.