Holly Black is the bestselling author of several contemporary fantasy novels for younger and older readers, including Tithe, Valiant, Ironside, The Spiderwick Chronicles, and the graphic novel series, The Good Neighbors. She is an unrepentant geek, having met her husband when they were rival Dungeon Masters and currently living in a house with a secret library hidden behind a bookshelf.

Cecil Castellucci is the author of three young adult novels—Boy Proof, The Queen of Cool, and Beige—and the Plain Janes graphic novel series. Her books have received starred reviews and been on the American Library Association’s Best Books for Young Adults (BBYA), Quick Pick for Reluctant Readers, Great Graphic Novels for Teens, and the Amelia Bloomer lists. Cecil waves her geek flag high. She waited on the Star Wars Episode One line on Hollywood Boulevard for six weeks, she invited Batman to her fourth birthday party, and she has a collection of broken action figures.