Christina Diaz Gonzalez is the Edgar Award-winning author of Concealed, Moving Target, The Red Umbrella and A Thunderous Whisper. She is the author of the graphic novel Invisible, with Gabriela Epstein. Her books have received numerous honors and recognitions including the Florida Book Award and the Nebraska Book Award. They have also been named the American Library Association's Best Fiction for Young Adults, a Notable Social Studies Trade Book for Young People, and the International Reading Association's Teachers' Choice. Learn more at christinagonzalez.com.

Gabriela Epstein is the creator of the New York Times bestselling graphic novel adaptation of Claudia and the New Girl by Ann M. Martin. She graduated from the Rhode Island School of Design with a degree in illustration and has worked as a character designer for TV animation. When she isn't making comics, she enjoys yo-yoing, listening to spooky podcasts, and watching historical documentaries. She lives in Austin, Texas. Visit her online at gre-art.com.