Madeleine Roux is the New York Times bestselling author of Asylum, which has sold into nine countries around the world, and its sequel, Sanctum, which SLJ called seriously spooky. Catacomb is the third installment in the series about Dan, Abby, and Jordan. Madeleine is also the author of Allison Hewitt Is Trapped and Sadie Walker Is Stranded. A graduate of the Beloit College MFA program, Madeleine now lives in Southern California. Tim Probert has illustrated children's books, including Pickle by Kim Baker, as well as magazines and advertisements. He is also a director at the animation studio Aardman Nathan Love. He lives in New York City.