Brothers in Arms (Oxford Bookworms Library Level 4)

Why aren't the students at Mangrove High School allowed to study maths or use computers? Who are the strange Wardens who watch over them all the time? And is someone listening in on their thoughts, when they are sent to The Room? Finn and Ellie both know that something isn't right in their world. But when they start asking questions, their lives are turned upside-down - and suddenly even their families are no longer what they seemed. Finn is in great danger, but when his brother Adam offers to help, he needs to find out fast if he can really trust him...