The Monster High Books - X3 Books are a series of junior novels published by Hachette Children's Group in 2016. "Welcome to Monster High: The Junior Novel 6" by Mattel UK Ltd is one of the titles included in this collection. Written in English, the paperback books are suitable for children and young adults who enjoy fantasy and humor genres. With a total of 144 pages, these books are perfect for fans of the Monster High series who want to delve into the world of these unique creatures.