Sibéal Pounder is the number one New York Times bestselling author of the much-loved children's fiction series Witch Wars, Bad Mermaids and Neon's Secret UNIverse, and the Christmas hit Tinsel. She has also written Beyond Platform 13, the sequel to Eva Ibbotson's The Secret of Platform 13 and the globally bestselling novelisation of the film Wonka. Her World Book Day book Bad Mermaids was a Sunday Times Bestseller, and Witch Wars was shortlisted for the Waterstones Children's Book Prize and the Sainsbury's Children's Book Award.