Katherine Rundell spent her childhood in Africa and Europe and is now a Fellow of All Souls College, Oxford.

She is also the bestselling author of Rooftoppers, a story inspired by summers working in Paris and by night-time trespassing on the rooftops of All Souls.

Rooftoppers won the Waterstones Children's Book Prize and the Blue Peter Award in 2014 and was shortlisted for many others. The Wolf Wilder is the first of three new novels with Bloomsbury.

Emily Sutton graduated from Edinburgh College of Art with a degree in illustration. As well as illustrating picture books, she paints, sculpts and designs prints.

Her first book with Walker, Tiny: The Invisible World of Microbes, written by Nicola Davies, began an exciting new strand of very young non fiction; her second was the beautiful picture book The Christmas Eve Tree, a future classic. Emily lives in York.