Mark Sperring studied at Bath Academy of Art and Camberwell College of Art before working as a printer and a bookseller, and later becoming a children's book author.

Mark is the author of The Shape of My Heart (Bloomsbury), Captain Buckleboots on the Naughty Step (Puffin) and The Sunflower Sword (Andersen). He lives in Bristol.

Maddie Frost creates her illustrations by making handmade textured and patterned swatches with materials like watercolour paint, crayon, pencils, and even kitchen spices! She scans the swatches into Photoshop and digitally cuts the shapes she needs to make something.

Her final images can consist of anywhere from fifty to five hundred pieces that are all layered together. Maddie lives in Arlington, Massachusetts, with her husband.