Vivian French is a highly acclaimed children's author who has written more than 250 books during the course of her career, including Caterpillar, Butterfly, The Tales from the Five Kingdoms series and Yucky Worms.

Her recent work includes the critically acclaimed picture book The Most Wonderful Thing in the World and junior fiction The Adventures of Alfie Onion, The Cherry Pie Princess and The Witches' Midnight Feast.

Vivian teaches on the illustration course at Edinburgh School of Art, and helped to found the mentoring scheme Picture Hooks for aspiring young illustrators. She lives in Edinburgh

Sue Heap is an award-winning children's book author and illustrator. She won the Smarties Book Prize for Cowboy Baby and has enjoyed great critical and commercial success with Polly's Pink Pyjamas by Vivian French and How to Be a Baby, by Me, the Big Sister, which was on the New York Times Bestseller List.

Sue lives in Chipping Norton, Oxfordshire.