If you a fan of The Giver and Lois Lowry, do not miss reading her post about the ending of her book.
To be honest, I don't think it is the function of a book (or an author) to answer questions, really. I think a book should CREATE questions. It should make the reader think, and wonder, and worry, and discuss, and imagine.
(Lowry is virtually knocking her head against a wall about folks who use the comments section to ask her questions about her writing and books. Folks just don't read the directions.)