Charlotte Guillain lives in Oxfordshire, UK. She writes fiction and non-fiction for children, including the picture book Spaghetti with the Yeti, which was shortlisted for Oscar's First Book Prize 2014 and has featured in CBeebies Bedtime Stories.Sally Agar is an illustrator and designer from North Yorkshire, UK. She spent the first ten years of her career living in Sweden, working as a print designer in the fashion industry. She is the illustrator of Alexander von Humboldt in the Little People, BIG DREAMS series and loves working with colour, texture and pattern to bring spark and energy to her work.