The Demon Headmaster and the Prime Minister's Brain
Gillian Cross
The arrival of a new computer game with its competition to find the Junior Computer Brain of the Year, sends ripples of excitement through the school. Clever Dinah who makes it to the final, but too late she realizes that she’s being used to access the private computer files of the Prime Minister – the daring new target of the Demon Headmaster!
Reviews

I liked this book. My favourite bits were where the children were trying to crack the password for the S-700.
Captain Fandango Paperclip 30.08.2021

As good as the first. You expect it to be boring and have the same story, but it has so much mysteries and shocks making you believe there will be a different twist.
General Sapphire Luther 13.07.2020

I found this book interesting and I really liked the ending when Dinah risked her life as she went on the computer to stop the headmaster from getting in the prim minister's brain knowing it would cause fire.
Anonymous 15.08.2017

It is really very good.
Anonymous 14.08.2014