The Demon Headmaster and the Prime Minister's Brain

Octopus Dare is the new computer game at school - everyone's playing it. But only Dinah is any good at it. Soon all she can think about is Octopus Dare. She wins a place at the grand final, and she's over the moon. But there's something strange about it all that worries Dinah - so her friends come with her to the final. Before long they find themselves in trouble...facing their old enemy, the Demon Headmaster. BLGillian Cross has won the Carnegie Medal, the Whitbread Children's Novel Award, and the Smarties Prize, and is a highly-acclaimed author. Sales of her books exceed one million copies.