Michael Gilbert 
Night Of The Twelfth [EPUB ebook] 

Two children have been murdered. When a third is discovered — the tortured body of ten-year-old Ted Lister — the Home Counties police are compelled to escalate their search for the killer, and Operation Huntsman is intensified. Meanwhile, a new master arrives at Trenchard House School. Kenneth Manifold, a man with a penchant for discipline, keeps a close eye on the boys, particularly Jared Sacher, son of the Israeli ambassador.