This book was absolutely adventurous! If you understand how computers work, you would probably like this. I did! It's basically about these five orphans who live in a bunker from World War 2. They escaped the children's home in London from the help of their friend Noble. Then they discover this super computer that can steal documents from foreign governments in nanoseconds. But there is a problem with the computer: it has a virus. THE ENDING WAS TERRIBLE. WHY? Read this! You won't regret it!