Katherine Rundell is the #1 New York Times bestselling author of Impossible Creatures and The Poisoned King. Her other books for children include Rooftoppers , Cartwheeling in Thunderstorms , The Wolf Wilder, The Explorer, and The Good Thieves . For adult readers, Rundell has written Vanishing Treasures: A Bestiary of Extraordinary Endangered Creatures and Super-Infinite: The Transformations of John Donne , which won the Baillie Gifford Prize for Non-Fiction. She was the recipient of the British Book Award for Book of the Year and Author of the Year. She grew up in Zimbabwe, Brussels, and London, and is currently a Fellow of St. Catherine's College, Oxford. Ashley Mackenzie is a Canadian artist and illustrator with a special affinity for dragons, dryads, and all magical creatures.