This fantasy/romance book is the second in the "Twilight Saga" by Stephenie Meyer and is published by Little, Brown and Company Books for Young Readers, an imprint of the Hachette Book Group.
New Moon is written for kids ages 12 and up. The age range reflects readability and not necessarily content appropriateness.
PluggedIn.com, an entertainment and media ministry of Focus on the Family, has written an article that offers an overview of the whole "Twilight" series: Darkness Falls After Twilight.
Book reviews cover the content, themes and worldviews of fiction books, not their literary merit, and equip parents to decide whether a book is appropriate for their children. A book's inclusion does not constitute an endorsement by Focus on the Family.