How does Rolf become a secret agent? He gets a very secret mission! An exciting book at AVI M4 level for children aged 9-12 who find reading difficult or not fun. This exciting book about a secret class is written at a low AVI level (M4), but it is intended for children aged 9-12, so it is certainly not childish. The books in the 'Makkelijk & Leuk' series are dyslexia-friendly and specially written for children who find reading difficult or not fun. This way, children with reading difficulties or aversion to reading regain their enjoyment of reading! Rolf is going to a new school. But where does the elevator take him? What is happening in the classroom upstairs? That is a secret. It is a class for secret agents. Shhh! Don't tell anyone!