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.