Demon Headmaster and the Prime Minister's Brain

There''s a new computer game at school and the chance to enter the Junior Computer Brain of the Year competition is sending ripples of excitement through the pupils. Dinah is a whizz at the game and soon finds herself in the competition final. But it takes a while to realize that it''s all just part of the Demon Headmaster''s latest plan . . . Dinah is being used to access the computer of the Prim...