Sibéal Pounder is the author of the bestselling Witch Wars and Bad Mermaids series of books. Her debut, Witch Wars , was shortlisted for the Sainsbury's Children's Book Award and the Waterstones Children's Book Prize. Bad Mermaids Meet the Witches was a 2019 World Book Day title and a Sunday Times bestseller and has been optioned by Sony Animation. She has also written Beyond Platform 13 , a sequel to Eva Ibbotson's The Secret of Platform 13 , and her latest book Tinsel is all about a young girl called Blanche Claus and asks the question: what if a long time ago we all got the Santa story a bit wrong? Previously Sibéal worked as a journalist, writing for publications including the Guardian and Vogue Online and was a philanthropy columnist for the Financial Times . Laura Ellen Anderson is a professional children's book author and illustrator with an increasing addiction to coffee (that is, when she's not trying to take over the world or fighting sock-stealing monsters). She spends every waking hour creating and drawing and would quite like to live on the moon when humans finally make it possible. Laura is also the author-illustrator of the Amelia Fang series.