Books with author gillian cross

Dinah and her brothers are pretty sure they're rid of the Demon Headmaster once and for all. When people start dismantling the research centre Dinah contacts Professor Claudia Rowe, who's an expert on artificial intelligence. With Dinah's help she saves some of the precious materials and theybecome friends. Then weird things start to happen. Libraries start closing and their books are taken away. Telephones stop working, and there is no internet access. People start talking like robots-even Claudia Rowe-and more and more of them seem to be wearing strange badges. It all adds up to onething: the Demon Headmaster must be back. Dinah's search leads her to the university where she finds him developing a Hyperbrain-a computer with superhuman intelligence and deadly potential. Suddenly she's trapped. Is there any way to foil his plan?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.

Hope has gone. Warren saw her being taken from her prison under their father's house but was too scared to intervene. Now he wishes he'd been brave enough to stop Rob, Emma and Tom kidnapping her. His father is furious, but it's the behaviour of Warren's normally-cowed mother that's mostfrightening. For years she has known her daughter was safe in the hole under the conservatory. But now Hope is out in the world, and anything could happen to her. Mum has to get her back. She's going to start by doing something terrible to Hope's kidnappers, and Warren must help.Rob, Tom and Emma have other things on their mind. When they took Hope, it was to save her. But now Hope has disappeared. Could she somehow have escaped to the world of miniature people where Rob's friend Lorn is fighting for survival?Just when the three friends need to be closest, Emma disappears and Tom starts acting really weirdly. Rob is sure the man with blue eyes has something to do with it. He's seen him in town again. If he dares to confront him, will he be able to save his pals? And if he's wrong, what price will theyall end up paying?