Dinah and her brothers have moved house as their dad's got a new job at the Biogenetic Research Centre. It sounds great, but all three realize something very weird's going on. People in the village talk like robots when the centre is mentioned. There's a mysterious buzzing sound near the centre, and a creeper that can grow at an incredible speed. And why is the centre surrounded by such scary security guards? When the kids start probing, they soon run into trouble. Dinah finds she herself is part of a terrifying DNA experiment-masterminded by none other than the Demon Headmaster. Gillian Cross has won the Carnegie Medal, the Whitbread Children's Novel Award, and the Smarties Prize, and is a highly-acclaimed author. The sales of Gillian's books exceed one million copies.