Little, Brown will extend its publishing program for Mattel’s Monster High into middle grade readers by Gitty Daneshvari, author of the School of Fear books. The first Monster High series, by Lisi Harrison, consists of four YA novels. “As the [Monster High] brand has grown exponentially, more of Mattel’s products were skewing younger, and this was becoming the core age for the property,” says Erin Stein, senior executive editor at Little, Brown Books for Young Readers. She adds that anecdotal evidence suggested demand from girls who liked the property but were too young for the YA books.