Amazon.com Product Description (ISBN 0192753886, Paperback)

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. Sales of Gillian's books exceed one million copies.

Amazon.com Product Description (ISBN 0192714538, Paperback)

In this latest book in the `Demon Headmaster' series, the Demon Headmaster is in charge of a scientific research centre and has created an Evolution Accelerator: a machine to speed up the evolution process and produce the perfect human. But for this he needs Dinah's DNA, and then to put her into terrible danger to test his theories...

Amazon.com Product Description (ISBN 0192718584, Paperback)

The fourth Demon Headmaster book. The Demon Headmaster is in charge of a scientific research centre and has created an Evolution Accelerator: a machine to speed up the evolution process and produce the perfect human. But for this he needs Dinah's DNA, and then to put her into terrible danger to test his theories. . . * The best-selling series which inspired the top-rating television series * Author with sales of over a million books * Prize-winning author - winner of Smarties Prize, Whitbread Award and Carnegie Medal * Now reissued for the first time as a matching set, with eyecatching fluorescent covers and a sturdy sewn binding. * Gillian Cross lives in Warwickshire.