Don't Tell Teacher

For, switching her six-year-old son to the local academy school marks a fresh start, post-divorce. With its excellent reputation and delightful red-brick building, Lizzie knows it'll be a safe space away from home. But there's something strange happening at school. Parents are forbidden from entering the grounds and inside, there are bars across the classroom windows. Why is Tom coming home exhausted, unable to remember anything about his day? What are the strange marks on his arm?