Sibéal Pounder is the author of the bestselling Witch Wars and Bad Mermaids series. 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 two Christmas themed middle grade novels. 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.